Since 2002 , YAOHUI has become the leader in Lens & Visor optical product manufacturing shipping in China and all over the world . Our factories are ISO9001 : 2000 certified and we have internal Lab for testing our product to the most difficult norm in the world such as CE , ECE22-05 , SNELL or DOT.... YAOHUI has 4 successful factories : Visor Factory : We are the n°1 Helmet visor manufacturer in China and certainly in the world with our advanced production all integrated from PC injec