synchronous belt pulley (XL,L,H,XH,XXH) HTP Timing pulleys(3M, ... pulleys (T2.5,T5,T10,T20,AT5,AT10),et synchronous belt pulley (XL,L,H,XH,XXH) HTP Timing pulleys(3M ... )The surface treatment of timing belt pulleys is black phophated(except alluminiummaterial),iron should be dynamically balanced.we can also supply the ...