O-rings Size: Standard and Unstadard size are available Material: EPDM, NBR, HNBR, Silicone, FKM, Viton, NR, PU and so on O-rings 1, Size: Standard and Unstadard size are available 2, Color: Various color are availabe3, Material: EPDM, NBR, HNBR, Silicone, FKM, Viton, NR, PU and so on 4, Certificate: ISO 9001 5, Usage: widely used in industries Red color heat resistance PU O-rings