A1: We provide production samples ahead of mass production for all customers if needed. We have two times test for all goods, one is the workshop staff to check the goods,  the other is business staff to recheck the goods. A2: We provide quality certs such as measurement report, material data sheet, COO, COA, etc.  to all customers before delivery. A3: We accept third party inspection such as SGS, TUV, INTERTEK, BV, etc.