They're tapered versions of the smooth-spinning ball bearing rollers from Item 15464 JR HG Alum Ball-Race Rollers 19mm (Ringless). Tapering them encourages the vehicle to keep on program when it mounts the walls, because of the aim of raising your competition completion price!
• Tapered Aluminum Ball-Race Rollers x2
• Purple anodized finish.
• Built-in 520 ball bearings.
• Screws and spacers to be used in attachment included.
• Compatible with Mini 4WD PRO and Mini 4WD cars. Some systems may necessitate modification.
