... 9001:2008 Standard and non-standard customized OEM Sprocket/Gear/Sand Casting Timing pulley Standard and non-standard. Material: Carbon Steel ... , Aluminum. Type: MXL, XL, L, H, XH, XXH, T2.5, T5, T10, T20, 3M ... . With all kinds of surface treatment. customized OEM Sprocket/Gear/Sand Casting