XRAY 12mm Hex "Aerodisk" 1/10 Rear Buggy Wheels. These IFMAR legal wheels are specifically designed to work with the rear of the XRAY XB2 or XB4. Made from a durable and flexible material with special reinforced ribs to make the wheels more stable and eliminate deformation. A deep countersunk center allows the wheel nut to be deeper inside the wheels. The sides of the wheels are aerodynamic for maximum performance. Package includes two rear buggy wheels.