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Concentrations and Credit Risk (Details 4) - USD ($)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Sales of finished goods $ 6,901,274 $ 5,171,675
Bak Shenzhen [Member]    
Purchase of inventories [1] 3,841,680
Shenzhen Bak [Member]    
Purchase of inventories [1] $ 69,226 $ 83,841
[1] Mr. Xiangqian Li, the former CEO, is a director of this company.