These are TAMIYA tapered ball race rollers for MINI4WD race cars. Tapering them encourages the car to stay on the course when it mounts the walls, with the aim of raising your race completion rate!
• 13mm Tapered Aluminum Ball-Race Rollers (Ringless) x2
• Built-in 520 ball bearings give smooth rotation.
• Screws and spacers for use in attachment included