Wheel Bearing - Upgrade Kit - Rear - Bearings incorporate larger balls providing larger load carrying capacity, and now sit on the axle instead of the wheel collars - Collars and bearing spacer made of military hard anodizing to prevent wear - Collars incorporate Pivot Works watertight O-ring design to keep hubs dry - Upgrade kit includes: - Bearings - Seals - Watertight wheel collars - Bearing spacer - Two sets of O-rings - Replacement bearings and seals sold separately.