IFMAR legal, specially-designed 4WD front wheels with 12mm inside hex. Perfect fit, and ideal for high-competition competition. The tires are constructed with versatile product while nonetheless being durable against effects. Along side it of wheel is aerodynamic for maximum performance. Medium hardness. Unique highlights of the wheel are noticeable through the inside: reinforcement ribs to make the tires as stable as possible and eliminate deformation. Group of 5 pairs (10 pcs) the price tag on 4 pairs. An unbelievable value pack. Fits all XB4