RFX Pro FAST Wheel Spacers Rear (Green) Contains bearings + seals Contains bearings + seals Durable poly oxford fabric construction Constructed from 7075 T6 aluminium with a unique taper design to allow for quicker wheel changes without spacer dropping out Colour anodised to increase durability which helps to reduce surface wear and lessens the amount of dirt entering the hub which in turn extends the life of the bearing