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    <link:label id="lab_cmt_DomesticLineofCreditAdditionalAmountMember_E1FF509FAB4FC1E60C62C9197659575E_label_en-US" xlink:label="lab_cmt_DomesticLineofCreditAdditionalAmountMember_E1FF509FAB4FC1E60C62C9197659575E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Domestic Line of Credit Additional Amount [Member]</link:label>
    <link:label id="lab_cmt_DomesticLineofCreditAdditionalAmountMember_E1FF509FAB4FC1E60C62C9197659575E_documentation_en-US" xlink:label="lab_cmt_DomesticLineofCreditAdditionalAmountMember_E1FF509FAB4FC1E60C62C9197659575E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Domestic Line of Credit Additional Amount [Member]</link:label>
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    <link:label id="lab_us-gaap_LoansPayable_D3CDC4830B71FB06BFCFC919765BE807_label_en-US" xlink:label="lab_us-gaap_LoansPayable_D3CDC4830B71FB06BFCFC919765BE807" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Loans Payable</link:label>
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    <link:label id="lab_cmt_DebtCurrentNet_D7F593A3CC3F0C92ABB2C919765BB757_terseLabel_en-US" xlink:label="lab_cmt_DebtCurrentNet_D7F593A3CC3F0C92ABB2C919765BB757" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Debt, Current, Net</link:label>
    <link:label id="lab_cmt_DebtCurrentNet_D7F593A3CC3F0C92ABB2C919765BB757_label_en-US" xlink:label="lab_cmt_DebtCurrentNet_D7F593A3CC3F0C92ABB2C919765BB757" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Debt, Current, Net</link:label>
    <link:label id="lab_cmt_DebtCurrentNet_D7F593A3CC3F0C92ABB2C919765BB757_documentation_en-US" xlink:label="lab_cmt_DebtCurrentNet_D7F593A3CC3F0C92ABB2C919765BB757" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Debt, Current, Net - Current debt net of unamortized loan costs.</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_04B1E122AECE2116115CC4141E3AFC95_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_04B1E122AECE2116115CC4141E3AFC95" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
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    <link:label id="lab_srt_MajorCustomersAxis_3FBA48F8C04ABEF5C86CC4141DD345F3_terseLabel_en-US" xlink:label="lab_srt_MajorCustomersAxis_3FBA48F8C04ABEF5C86CC4141DD345F3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Major Customers [Axis]</link:label>
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    <link:label id="lab_srt_NameOfMajorCustomerDomain_B495BF1490DDD8C4948BC4141DD39710_terseLabel_en-US" xlink:label="lab_srt_NameOfMajorCustomerDomain_B495BF1490DDD8C4948BC4141DD39710" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Name of Major Customer [Domain]</link:label>
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    <link:label id="lab_cmt_NavistarMember_0852AEEA1A11819F697AC4141DD48BAD_terseLabel_en-US" xlink:label="lab_cmt_NavistarMember_0852AEEA1A11819F697AC4141DD48BAD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Navistar [Member]</link:label>
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    <link:label id="lab_cmt_NavistarMember_0852AEEA1A11819F697AC4141DD48BAD_documentation_en-US" xlink:label="lab_cmt_NavistarMember_0852AEEA1A11819F697AC4141DD48BAD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Navistar [Member]</link:label>
    <link:loc xlink:href="cmt-20200331.xsd#cmt_NavistarMember" xlink:label="loc_cmt_NavistarMember_0852AEEA1A11819F697AC4141DD48BAD" xlink:type="locator" />
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    <link:label id="lab_cmt_VolvoMember_FC66A031EEAA19CAAD67C4141DD4E16D_terseLabel_en-US" xlink:label="lab_cmt_VolvoMember_FC66A031EEAA19CAAD67C4141DD4E16D" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Volvo [Member]</link:label>
    <link:label id="lab_cmt_VolvoMember_FC66A031EEAA19CAAD67C4141DD4E16D_label_en-US" xlink:label="lab_cmt_VolvoMember_FC66A031EEAA19CAAD67C4141DD4E16D" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Volvo [Member]</link:label>
    <link:label id="lab_cmt_VolvoMember_FC66A031EEAA19CAAD67C4141DD4E16D_documentation_en-US" xlink:label="lab_cmt_VolvoMember_FC66A031EEAA19CAAD67C4141DD4E16D" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Volvo [Member]</link:label>
    <link:loc xlink:href="cmt-20200331.xsd#cmt_VolvoMember" xlink:label="loc_cmt_VolvoMember_FC66A031EEAA19CAAD67C4141DD4E16D" xlink:type="locator" />
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    <link:label id="lab_cmt_UniversalForestProductsMember_4B1AEA3B90E81695BD0BC4141DD4D067_terseLabel_en-US" xlink:label="lab_cmt_UniversalForestProductsMember_4B1AEA3B90E81695BD0BC4141DD4D067" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Universal Forest Products [Member]</link:label>
    <link:label id="lab_cmt_UniversalForestProductsMember_4B1AEA3B90E81695BD0BC4141DD4D067_label_en-US" xlink:label="lab_cmt_UniversalForestProductsMember_4B1AEA3B90E81695BD0BC4141DD4D067" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Universal Forest Products [Member]</link:label>
    <link:label id="lab_cmt_UniversalForestProductsMember_4B1AEA3B90E81695BD0BC4141DD4D067_documentation_en-US" xlink:label="lab_cmt_UniversalForestProductsMember_4B1AEA3B90E81695BD0BC4141DD4D067" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Universal Forest Products [Member] - Major customer of the Company</link:label>
    <link:loc xlink:href="cmt-20200331.xsd#cmt_UniversalForestProductsMember" xlink:label="loc_cmt_UniversalForestProductsMember_4B1AEA3B90E81695BD0BC4141DD4D067" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cmt_UniversalForestProductsMember_4B1AEA3B90E81695BD0BC4141DD4D067" xlink:to="lab_cmt_UniversalForestProductsMember_4B1AEA3B90E81695BD0BC4141DD4D067" xlink:type="arc" />
    <link:label id="lab_cmt_PaccarMember_03CC9DFDFE6C92BFBBEAC4141DD4CED2_terseLabel_en-US" xlink:label="lab_cmt_PaccarMember_03CC9DFDFE6C92BFBBEAC4141DD4CED2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Paccar [Member]</link:label>
    <link:label id="lab_cmt_PaccarMember_03CC9DFDFE6C92BFBBEAC4141DD4CED2_label_en-US" xlink:label="lab_cmt_PaccarMember_03CC9DFDFE6C92BFBBEAC4141DD4CED2" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Paccar [Member]</link:label>
    <link:label id="lab_cmt_PaccarMember_03CC9DFDFE6C92BFBBEAC4141DD4CED2_documentation_en-US" xlink:label="lab_cmt_PaccarMember_03CC9DFDFE6C92BFBBEAC4141DD4CED2" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Paccar [Member]</link:label>
    <link:loc xlink:href="cmt-20200331.xsd#cmt_PaccarMember" xlink:label="loc_cmt_PaccarMember_03CC9DFDFE6C92BFBBEAC4141DD4CED2" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cmt_PaccarMember_03CC9DFDFE6C92BFBBEAC4141DD4CED2" xlink:to="lab_cmt_PaccarMember_03CC9DFDFE6C92BFBBEAC4141DD4CED2" xlink:type="arc" />
    <link:label id="lab_cmt_BRPMember_0F61863BD1FF7BEDAFD2C4141DD5A4CD_terseLabel_en-US" xlink:label="lab_cmt_BRPMember_0F61863BD1FF7BEDAFD2C4141DD5A4CD" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">BRP [Member]</link:label>
    <link:label id="lab_cmt_BRPMember_0F61863BD1FF7BEDAFD2C4141DD5A4CD_label_en-US" xlink:label="lab_cmt_BRPMember_0F61863BD1FF7BEDAFD2C4141DD5A4CD" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">BRP [Member]</link:label>
    <link:label id="lab_cmt_BRPMember_0F61863BD1FF7BEDAFD2C4141DD5A4CD_documentation_en-US" xlink:label="lab_cmt_BRPMember_0F61863BD1FF7BEDAFD2C4141DD5A4CD" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">BRP [Member] - Major customer of the Company</link:label>
    <link:loc xlink:href="cmt-20200331.xsd#cmt_BRPMember" xlink:label="loc_cmt_BRPMember_0F61863BD1FF7BEDAFD2C4141DD5A4CD" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cmt_BRPMember_0F61863BD1FF7BEDAFD2C4141DD5A4CD" xlink:to="lab_cmt_BRPMember_0F61863BD1FF7BEDAFD2C4141DD5A4CD" xlink:type="arc" />
    <link:label id="lab_cmt_OtherCustomersMember_EDDF25620A6342FD0DC7C4141DD53976_terseLabel_en-US" xlink:label="lab_cmt_OtherCustomersMember_EDDF25620A6342FD0DC7C4141DD53976" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other Customers [Member]</link:label>
    <link:label id="lab_cmt_OtherCustomersMember_EDDF25620A6342FD0DC7C4141DD53976_label_en-US" xlink:label="lab_cmt_OtherCustomersMember_EDDF25620A6342FD0DC7C4141DD53976" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Other Customers [Member]</link:label>
    <link:label id="lab_cmt_OtherCustomersMember_EDDF25620A6342FD0DC7C4141DD53976_documentation_en-US" xlink:label="lab_cmt_OtherCustomersMember_EDDF25620A6342FD0DC7C4141DD53976" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Other Customers [Member]</link:label>
    <link:loc xlink:href="cmt-20200331.xsd#cmt_OtherCustomersMember" xlink:label="loc_cmt_OtherCustomersMember_EDDF25620A6342FD0DC7C4141DD53976" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_cmt_OtherCustomersMember_EDDF25620A6342FD0DC7C4141DD53976" xlink:to="lab_cmt_OtherCustomersMember_EDDF25620A6342FD0DC7C4141DD53976" xlink:type="arc" />
    <link:label id="lab_srt_ProductOrServiceAxis_9E303B8580D13316271BC4141DD54F4E_terseLabel_en-US" xlink:label="lab_srt_ProductOrServiceAxis_9E303B8580D13316271BC4141DD54F4E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Product and Service [Axis]</link:label>
    <link:label id="lab_srt_ProductOrServiceAxis_9E303B8580D13316271BC4141DD54F4E_label_en-US" xlink:label="lab_srt_ProductOrServiceAxis_9E303B8580D13316271BC4141DD54F4E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Product and Service [Axis]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductOrServiceAxis" xlink:label="loc_srt_ProductOrServiceAxis_9E303B8580D13316271BC4141DD54F4E" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProductMember_EC7ABFAD5E409BED923BC4141DD62A6C_terseLabel_en-US" xlink:label="lab_us-gaap_ProductMember_EC7ABFAD5E409BED923BC4141DD62A6C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Product [Member]</link:label>
    <link:label id="lab_us-gaap_ProductMember_EC7ABFAD5E409BED923BC4141DD62A6C_label_en-US" xlink:label="lab_us-gaap_ProductMember_EC7ABFAD5E409BED923BC4141DD62A6C" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Product [Member]</link:label>
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    <link:label id="lab_us-gaap_ServiceMember_0CD9CD8DDA765356EC8BC4141DD6DA32_terseLabel_en-US" xlink:label="lab_us-gaap_ServiceMember_0CD9CD8DDA765356EC8BC4141DD6DA32" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Service [Member]</link:label>
    <link:label id="lab_us-gaap_ServiceMember_0CD9CD8DDA765356EC8BC4141DD6DA32_label_en-US" xlink:label="lab_us-gaap_ServiceMember_0CD9CD8DDA765356EC8BC4141DD6DA32" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Service [Member]</link:label>
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    <link:label id="lab_us-gaap_EntityWideRevenueMajorCustomerLineItems_2065700ACE247C7E5AA7C4141DD6636A_label_en-US" xlink:label="lab_us-gaap_EntityWideRevenueMajorCustomerLineItems_2065700ACE247C7E5AA7C4141DD6636A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Revenue, Major Customer [Line Items]</link:label>
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    <link:label id="lab_cmt_NumberofMajorCustomers_525109A377411C45DF8EC4141DD7567E_terseLabel_en-US" xlink:label="lab_cmt_NumberofMajorCustomers_525109A377411C45DF8EC4141DD7567E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Number of Major Customers</link:label>
    <link:label id="lab_cmt_NumberofMajorCustomers_525109A377411C45DF8EC4141DD7567E_label_en-US" xlink:label="lab_cmt_NumberofMajorCustomers_525109A377411C45DF8EC4141DD7567E" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Number of Major Customers</link:label>
    <link:label id="lab_cmt_NumberofMajorCustomers_525109A377411C45DF8EC4141DD7567E_documentation_en-US" xlink:label="lab_cmt_NumberofMajorCustomers_525109A377411C45DF8EC4141DD7567E" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Number of Major Customers - The amount of customers that contain 10% of total sales</link:label>
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