dear sir our factory specificalize in all kinds of USA standard o ring ,o ring kits,wrist bands, rubber gasket  for over many years,please let me know your interesting so as to our factory shall sent catalogues to you; also please let me know your order proposal so as to our factory shall quote China best competitive price to you; if you have time,our factory kindly invite you visit our facotry,when you reach Ningbo airport so as to our factory shall sent our car to pick you up; wait for your quickly reply! best regards mr jeffery Ningbo forever rubber&plastics factory Add:changhe industry zone,Ningbo,zhejiang,china; tel:0086-574-63408214; fax:0086-574-63405639;