Traditionally, the gear ratio in scooter CVTs is changed by the in-and-out rolling movement of the roller weights With the innovative DrDescription Traditionally, the gear ratio in scooter CVTs is changed by the in-and-out rolling movement of the roller weights. With the innovative Dr. Pulley sliding roller weights, the roller weights ??slide?? inward and outward in the Movable Drive Pulley (MDF) to change/extend the gear ratio. ? WARNING California Residents: Proposition 65 Warning Specifications Size: 17x12Available Weights: 6g, 12g