... , tensioner bearing, timing tensioner, steel sheave, conveyor pulley are high quality and most competitive in market.Features:Teeth Type: MXL,XL ... System:MXL,XL,L,H,XMaterial:1045 carbon steel, aluminum alloy frequently used,brass and nylon available.Surface treatment:black ... material of pulley mainly composed of carbon steel, if possible aluminum alloy nylon can also be employed; if external diameter ...