The transmission belt has two structures: cloth wrapping or trimming, and the special rubber fiber characteristics determine that it has high transverse stiffness and longitudinal flexibility at the same time, and has high load-bearing capacity and long life. Cast teeth reduce heat build-up or stress concentration, extending belt life. The smooth running structure allows the belt to change only slightly at high speeds. Meets RMA standards for oil and heat resistance. Gates variable speed with RMA standard, ISO standard, Gates special specifications.