... KFM,SILICON,EPDM 3 O-rings by customer`s drawing o ring box We have NBR o ring kit of(30 ... sizes, total 382pcs, AS568 standard) , model no: 5A(30sizes, total 382pcs, JIS B 2401 ... standard) ,model no:5B(30 sizes, total 386pcs, JIS B 2401 standard), model no: 5C(32 sizes, total 407pcs ... standard), model no:8B(32 sizes, total 419pcs, JIS B 2401 standard), model no: 8C5A.5B.5C.8B AS ...