Synchronous Belt Our timing belts are composed of closed round rubber, with teeth and attached belt or pulley. When working, tee Synchronous BeltTypes:1) T ... cause transmission of teeth, chain, and belt.3) High quality and long life.4) Used in machinery and equipment for sewing, food ... .5M, S5M, S8M, S14M, RP2M, RP3M, RP5M, RP8M, RP14M, etc. Synchronous Belt