Zinc-plating timing pulley are high quality and available ... to you. Features:1. Teeth Type: MXL,XL,L,H,XH,XXH,XXL,SL9,SL12,SL,HTD:3M,5M ... ,S5M,S8M,S14M)5. The British System: MXL,XL,L,H,X6. Material:1045 carbon steel, aluminum alloy frequently ... nylon available.7. Surface treatment: black oxdizing, phosphating, anodize, zinc-plating8. Tolerance: conform to customers requirement9. OEM/ODM service: offered ...