fkm o ring 1.Material:silicone,rubber ,NBR 2.Excellent flexibility. 3.Available in various sizes and colors. fkm o ring MaterialsSilicone, NBR, ... flexibilityRapid development line, from drawing, tool design to mold support and samplesSilicon rubber and EPDM products of various sections ... used in automobile, electronical and other industry Thank you for taking time to visit our products, pls feel free ...