This is a replacement Traxxas Aluminum Wheelie Bar Wheel Set, and is intended for use with the Traxxas Wheelie Bar Assembly. The precision 6061-T6 aluminum wheels feature a stunning anodized finish and they ride on rubber-sealed 5x8mm ball bearings. For controllable and seemingly never-ending wheelies, Traxxas developed a durable, soft compound rubber tire that reduces side-to-side movement for stable, consistent wheelies. The rubber tires are available separately and they also install on the stock nylon wheels.