... .Material:UHMW-PE,PU,PTFE.Nylon...... PU seal ring Company introduction Hebei Hengshui Jinggong Rubber&Plastic Products Co ... pulley/transmission wheel........ All material slideing block/check ring...........2.Beer Beverage Equipment Fittings M-SNB Series Conveying ... and Back Board, Hollow Leaning Wheel, Hollow Aluminum Ring, Hollow Nylon Ring, Hollow Carrier Roller, Hollow Wire Nylon Carrier Roller, ...