... , tensioner bearing, timing tensioner, steel sheave, conveyor pulley are high quality and most competitive in market.Features:Teeth Type: MXL,XL ... ,L,H,XMaterial:1045 carbon steel, aluminum alloy frequently used,brass and nylon available.Surface treatment:black oxdizing,phosphating,anodize ... if external diameter is larger than 250 mm, iron is used.The pitch&tooth type of double sided timing belt is ...