Types of timing belts provided: GPB Rubber Timing Belt T type: MXL, XL, L, H, XH, XXH GPB Double-side Timing belts: DXL, DL, DH GPB High Torque Timing Belt: S3M, S4.5M, S5M, S8M, S14M GPB Arc Tooth Industrial Rubber Timing Belt: H3M, H5M, H8M, H14M GPB PolyurethaneTiming Belt: T5, T10 GPB Double- side PolyurethaneTiming Belt: DT5, DT10