419pcs O-Ring Assortment *O ring: NBR *Case: ABS *Stretchy, durable, *temperature holding -20 degree to 80 ... degree 419pcs O-Ring Assortment1. Materials: NBR,also can be NR, HNBR, MVQ, ACM, FLS, CR, SBR ... .13. Small order quantity is welcomed. 419pcs O-Ring Assortment NBR