... have workshops for sprockets ,gears ,shafts etc.with good quality and best price.pulleys:pilot bore ... ,taper bore Pulleys,SPA/SPB/SPC/SPZ type pulleys,American Standard pulley,3V-5V-8V pulleys ... AK,BK series sheaves.variable pith sheaves,EUROPE type sheaves.taper bushings.Material: 45C.GG25,GGG40, ... T10,T20,AT5,AT10),BTL Timing pulleys(L,H,XH)with standardized desigh and well equipped CNC machining ...