Our timing belt is composed of closed round rubber, with teeth and attached belt or pulley. When working, teeth and trough are in harmony and one movement will cause transmission of teeth, chain, and belt. Our belts are strong, and resistant to oil, heat, and aging. We have over 30 kinds of belts in 1,000 specifications including DXL, DL, DH, DXH, DXXH, DT5, DT10, DT20, DAT5, DAT10, DAT20.