Model No: rubber O-ring kit assortment 8C Material: NBR Spec: 32 ... total 419 pcs, JIS B 240 standard. 1. rubber O-ring kit assortment 8C features :1) Material: NBR, NR, ... total 419 pcs, JIS B 240 standard4) Color of o-ring : black5) Color of box : blue,red,yellow,green2. ... We have below O ring kits: Model No.SizeTotal PcsStandard5A30 sizes382 pcsAS568 standard5B30 sizes382 ...