Unstoppable traction on virtually any terrain, including mud, sand, and even snow. Completely pre-assembled for installation in minutes. Oil-filled coil dampers control rotation. Adjustable tread accommodates irregular surfaces. Specially designed one-piece rubber tread has high tracking ability. Dramatically improves ground clearance and approach angle. Designed for fun in all weather conditions. Sealed bearings on the drive wheels. Low maintenance, self-lubricating bushings on the guide wheels. Longer rear Traxx drive units for steep inclines. Reusable molded foam storage box. Fits all TRX-4 models.