The service life of Punch CVT Bosch steel belt is 300,000 kilometers. According to relevant public information, Bosch's steel belts are made up of countless triangular pieces connected with steel belts. Bosch's steel belts are patented and cannot be copied. The steel belt of the CVT gearbox is made up of many interlocking steel rings and steel sheets. The CVT gearbox transmission method uses the friction between the steel belt and the cone wheel.