... : NBR *Case: ABS *Stretchy, durable, *temperature holding -20 degree to 80 degree 419pcs O-Ring Assortment1. Materials: NBR,also can be ... , FLS, CR, SBR, SI, BR, IR, EPDM, IIR, PU,E/A, ECO, CSM, VITON, FKM, FPM, etc.2. Characteristics: oil proof ... . 3. 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 ...