1.Certificated under ISO9001:2000,QS-9000.ISO/TS19649. 2.All parts are under rigid quality controll before shippment.,besides,we can make auto filters .according to your oem number. 3.Discounts are available for large quantities. 4.Your drawings and design are welcome. 5.If you have any interests in doing business with us,please feel free to contract us.