1,o ring kit. 2,various specification and good quality. 3,NBR,VITON,KFM,SILICON,EPDM. 4,make ... customer`s drawings. O ring kitsWe have NBR o ring kit of(30 sizes, total 382pcs, AS568 standard) , model no: 5A ... 2401 standard), model no: 8C 5A 5B 5C 8Bour Company and the equipment our product