33 percent lighter than the Powergrip series belts, Polychain belts provide less rotating weight and less centrifugal force on the belt translating to more strength to drive the load. Kevlar core construction offers more tensile strength than rubber belts and higher resistance to elongation. Part numbers in this category with a PS designation have been specifically engineered for Alcohol and Fuel car drag racing. Tests on championship race teams have shown an increase in reliability and an increase in the number of runs per belt. This belt should NOT be back bent around an idler pulley or during storage.