IFMAR appropriate size, specially-designed 2WD/4WD rear wheels with 12mm interior hex. The center countersunk area was redesigned to put the wheel nut much deeper. Precision fit, ideal for high-competition racing. Made from flexible, durable material to withstand effects. The medial side associated with wheel is aerodynamic for optimum performance. Medium hardness. Special features of the wheel are noticeable from inside: reinforcement ribs to help make the tires as stable as you possibly can and eliminate deformation. Group of 5 pairs (10 pcs) the cost of 4 pairs. A fantastic value pack. Fits all XB2 & XB4
