IFMAR appropriate, specially-designed 4WD front wheels with 12mm inside hex. Perfect fit, and ideal for high-competition competition. The tires are constructed of versatile item while nonetheless being durable against effects. The medial side of wheel is aerodynamic for maximum performance. Moderate hardness. Unique features regarding the wheel are noticeable through the inside: reinforcement ribs to make the tires as stable possible and eradicate deformation. Band of 5 pairs (10 pcs) the price tag on 4 pairs. A great value pack. Fits all XB4