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, oversize pulleys and variator. The engine block must be milled before this kit can be fitted (instructions included). Two sets of rolls are included for this variator, one set of 3.5 and a set of 3.8 gram 19 X 15.5 variator rolls.