open rubber cable grommet 1.Certificate: ISO9001:2008 SGS:FDA ROSH TEST 2. ... , the support ring, guide ring, the cushion ring, rubber buffer block,etc.Mainly rubber material are NR, NBR, FKM/VITON/FPM ... foreign customers.1.Description of products Open Rubber Cable Grommet Product Open Rubber Cable GrommetMaterialNR/Silicone/NBR/EPDM/SBR,etc.Hardness40~90 ...