Polini belts are designed to transfer more torque by eliminating ??Belt flex” This belt is woven to a higher standard then the stock belt 50cc 2-Stroke AC Last longer and almost always adds better top speed Manufactured in Italy Product Description Fan belts are absolute standard features which need to be replaced often due to wear and tear. POLINI fan belts are known for their high stability and withstand temperature damage, which hinders slipping or ripping. These reinforced belts can be used with original motors. For those in the know, motor tuning without re lacing fan belts is like driving your Porsche in second gear only. POLINI: Polyamide reinforced, dependable durability. Usually cheaper than manufacturer??s original part price!