1,Material:NBR, plastic, Viton, silicon, PUR, etc. 2,Color:brown ... . product detail:1. Specification 1) Material: NR, NBR/Nitrile rubber, CR/neoprene rubber, EPDM, Silicone, Viton/FKM and etc.2) Hardness ... request2. Our advantage 1) Over 10 years' experience in rubber product, can provide professional advise for product2) Over 5 ... ) always repsonsible attitude towards what we promised!! Rubber Grommets