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Concentrations (Tables)
6 Months Ended
Jun. 30, 2020
Risks and Uncertainties [Abstract]  
Schedule of customers
   Three Months Ended
June 30,
   Six Months Ended
June 30,
 
Customer  2020   2019   2020   2019 
A (Beijing Daopei, a related party)   *    14%   *    * 
B (Hebei Daopei, a related party)   *    14%   *    * 
C   28%   20%   29%   24%
D   17%   14%   17%   16%
E   14%   *    14%   * 

 

*Less than 10%