Specially-designed 2WD front wheels with 12mm internal hex. Perfect fit, recommended for high-competition racing. Made from very flexible yet durable material to withstand impacts. The side of the wheel is aerodynamic for maximum performance.Special features of the wheel are visible from the inside: reinforcement ribs to make the wheels as stable as possible and eliminate deformation.Set of 5 pairs (10 pcs) for the price of 4 pairs. A great value pack.