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.
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