Material:C45 steel, Aluminum(6061,7075), Nylon,POM, Plastic. Surface :Block oxide, Galvanize( white,blue,yellow) . Process:Hobbing. Standard size: HTD 3M, 5M, 8M, 14M, 20M T2.5, 5, 10 MXL, XL, L H, XH, XXH AT2.5, 5, 10 S2M. 3M, S4.5M ,5M, 8M ,14M 2MR, 3MR,5MR,8MR,14MR Belt width: all standard size or custom-made size Timing pulley type: AS type (without flange and hub) BS type(with hub, without flange) AF type(with double flange,with hub) BF type(with double flange and hub) W type(with lightening hole) Service;OEM/ODM Customer have drawing or samples,we also can custom-made them.