All series of timing pulley produced XL-XXH, 3M-20M, T2.5-T20 and AT5-AT10 produced by CHSSB/CAPT are adopted advanced production technology and of high quality. All these specifications can be sold off the shelf. The material can be S45C, GG25, FFF40, aluminium, nylon and stainless steeletc. The surface finish can be black oxide, phoshpating, anodization and zinc plating.