Poly v belts provided by SSYTT are made from CR, EPDM, PU, etc. and have the following features: 1) Double functions of both flat belt and v belt and high transmission efficiency. 2) Excellent flexibility, consequently suitable for high speed and big speed ratio transmission with linear velocity up to 40 m/s. 3) Compact driving system. 4) Less vibration, less heat-generation and lower noise. 5) Good resistance to heat, oil and abrasion and long service life.