... ring, guide ring, the cushion ring, rubber buffer block,etc.Mainly rubber material are NR, NBR, FKM/VITON/FPM ... ProductBlind rubber grommet MaterialNR/Silicone/NBR/EPDM/SBR,etc.Hardness40~90 Share ASizeCustomized/Standard and nonstandardColorBlack, Green ... , Red, White, Blue, brown, etc.Special featureshigh temperature resistance, good cold flexibility, good resistance ...