... all available. Description of Excellent O-ring Seal Conform to ROHS:1. Materials: can be NR o-ring seal, HNBR, Buna, FVMQ, MVQ ... FPM, etc.2. Characteristics: good physical and chemical properties o-ring seal. 3. Hardness: 30~90 shore A or IRHD ... NSF, KTW, WRAS, LFGB, etc. 8. Applications: automobile o-ring seal, electrical appliance, mechanical, industrial, construction, household, medical and other ...