They're double aluminum rollers offering smooth and stable running of the Mini 4WD machine. This set is sold with an inferior top roller which supports the automobile with regards to “leans” through a large part area.
• Lightweight Double Aluminum Rollers x2
• Purple anodized finish.
• 520 Ball Bearings x4
• 2x20mm Screws x2
• Around 20percent lighter than standard equivalents (Item 15398).
• Brass spacers and tiny components for attachment included.
• Compatible with Mini 4WD and Mini 4WD PRO cars
