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CONCENTRATION OF RISKS (Details) | 12 Months Ended
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Dec. 31, 2025 customer issuer | Dec. 31, 2024 customer issuer | Dec. 31, 2023 customer issuer
Foreign currency exchange rate risk |  |  |
Depreciation (appreciation) of the RMB against US dollar (as a percent) | (4.20%) | 2.80% | 2.90%
Customer concentration risk | Sales revenue |  |  |
CONCENTRATION OF RISKS |  |  |
Number of customers | customer | 5 | 5 | 5
Concentration risk percentage | 14.67% | 27.97% | 28.39%
Supplier concentration risk | Cost of goods |  |  |
CONCENTRATION OF RISKS |  |  |
Concentration risk percentage | 98.00% | 95.00% | 96.00%
Number of suppliers | issuer | 5 | 5 | 5

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