279pcs O-Ring Assortment 279pcs O-Ring Assortment1. Materials: NBR,also can be NR, ... , ACM, FLS, CR, SBR, SI, BR, IR, EPDM, IIR, PU,E/A, ECO, CSM, VITON, FKM, FPM, etc.2. Characteristics: oil ... ~2 weeks.13. Small order quantity is welcomed. O-Ring Assortment