Specially-designed 2WD/4WD rear tires with 12mm internal hex. The center countersunk area ended up being redesigned to place the wheel nut much deeper. Precision fit, ideal for high-competition race. Made from flexible, durable product to withstand effects. Along side it of this wheel is aerodynamic for optimum performance. Unique features of the wheel are noticeable from inside: reinforcement ribs to make the wheels as stable as you possibly can and eradicate deformation.