Specially-designed 2WD/4WD rear tires with 12mm internal hex. The guts countersunk area was redesigned to place the wheel nut deeper. Precision fit, perfect for high-competition race. Produced from flexible, durable material to withstand impacts. Along side it of this wheel is aerodynamic for optimum performance. Special options that come with the wheel are noticeable from the inside: reinforcement ribs to really make the tires as stable possible and eradicate deformation.