IFMAR appropriate, specially-designed 4WD front tires with 12mm inside hex. Perfect fit, and ideal for high-competition competition. The wheels are made of versatile product while nonetheless being durable against outcomes. The medial part pertaining to wheel is aerodynamic for optimum performance. Medium hardness. Unique top features of the wheel are noticeable from inside: reinforcement ribs to really make the tires as stable that you can and eradicate deformation. Group of 5 pairs (10 pcs) the cost of 4 pairs. A fantastic value pack. Fits all XB4