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 type synchronous belt2) T type synchronous double belt3) Arc tooth synchronous belt4) Arc tooth synchronous ... 5, T5, T10, T20, AT5, AT10, AT20, etc. Arc tooth:3M, 5M, 8M, 14M, 20M, S2M, S3M, S4.5M, ...