Pro Front Wheel Spacers. RFX Pro Series wheel spacers are lighter and more durable than O.E.M. Constructed from 7075-T6 aluminum and color anodized to increase durability. This helps to reduce surface wear and lessens the amount of dirt entering the hub which in turn extends the life of the bearing. Designed with a rear lip to help keep them hooked into the seals, this reduces the chance of falling out during maintenance, speeding up wheel changes. RFX products are tested and used by many top Grand Prix and British Motocross teams. Features: 7075-T6 aluminum construction. Color anodized for durability. Machined rear location lip. CNC machined for a tighter tolerance. Sold as a set.