The Malossi Over Range kit comes with 128mm pulleys, which provide good traction and improved top speed. This system is really eminent for tuned scooters. The kit contains the following parts: impeller, V-belt, overzize pulleys and variator. The engine block must be milled before this kit can be fitted (instructions included). Two sets of rollers are included for this variator, 1 set 3.5gr. and a set of 3.8gr. The roll size is 19x15.5