Offer NBR o ring kit with spec: 30 sizes, total 382pcs, AS568 standard 1. NBR o ring kit features:1) Material : NBR 2) M0del No. : 5A, 5B, 5C, 8B, 8C3) color of o-ring : Black4) color of box : blue, red, yellow Datalogue Details: Product Name NBR o ring kit Material NBR ( NR, FPM, MVQ, EPDM is available) Model No. 5A, 5B, 5C, 8B, 8C Color of o-ring Black (other color is available) Color of box ...