279pcs O-Ring Assortment 279pcs O-Ring Assortment1. Materials: NBR,also can be NR, HNBR, MVQ, ACM, ... Hardness: 30~90 shore A or IRHD as your request, tolerance is ± 5 shore A, and can be ±3 shore A ... for special products.4. Size tolerance: exactly upon your request or standard tolerance.5. Color: black, transparent, green, red, ... 1~2 weeks.13. Small order quantity is welcomed. O-Ring Assortment