Bearings typically fail from water and dirt contamination. The All Balls Rear Carrier Bearing Upgrade Kit was developed and designed for the difficult operating environment of the powersport industry. Kit contains ball bearings and seals - all that is required to successfully upgrade a rear carrier for smoother action and a longer life. Rubber sealed bearings for additional protection from water and dirt. Precision high-speed bearings manufactured to ABEC3 standards. Double-lip Type TC Nitrile Elastomer rubber seals which provide superior exclusion of water, dirt and improved grease retention. Bearings utilize Chevron SR1-2 grease which contains high-performance rust and oxidation inhibitors (-29°C to 177°C). Note: Kit contents will vary by fitment and are subject to change. Includes:2 Ball Bearings2 O-Rings2 Seals