... sizes all available. Description of Excellent O-ring Seal Conform to ROHS:1. Materials: can be NR o-ring seal, HNBR, Buna, FVMQ, ... NSF, KTW, WRAS, LFGB, etc. 8. Applications: automobile o-ring seal, electrical appliance, mechanical, industrial, construction, household, medical and ... provide high quality products and sincere service. In addition to o ring we also produce outside oil seal, rubber seal, ...