Material: Rubber or Polyurethane Size: 1.T type synchronous belts: MXL,XL,L,H,XH,XXH,T2.5,T5,T10,T20 2.Arc tooth synchronous belt: HTD-3M,5M,8M,14M,20M, STPD/STS-S2M, S3M, S4.5M, S5M, S8M, S14M