These are tapered versions of the smooth-spinning ball bearing rollers from Item 15464 JR HG Alum Ball-Race Rollers 19mm (Ringless). Tapering them encourages the car to stay on the course when it mounts the walls, with the aim of raising your race completion rate! - Tapered Aluminum Ball-Race Rollers x2 - Purple anodized finish. - Built-in 520 ball bearings. - Screws and spacers for use in attachment included. - Compatible with Mini 4WD PRO and Mini 4WD cars. Some bodies may require modification.
