Zhejiang Shuangyuan Industy&Trade Co., Ltd is specialize in producting trailer ball, trailer cover, trailer mount, trailer connector, trailer pin, trailer hook and plating piece series of trailer products. Our company has the productivity of eight hundred thousand pcs trailer balls and five hundred thousand pcs trailer covers. Facing the future with challenge and opportunity together, we will take �Quality first, Prestige highest� as our management tenet. Sincerely welcome the customers from all over the world come and negotiate with us