All Balls Racing ABR-25-3103 Inner Primary Bearing Kit for Big Twin 08-UpDescription for ALL BALLS Racing Inner Primary Bearing Kit For Hi Performance engines and bikes converted to open primary belt drive Rubber sealed bearings for additional protections from water, oil and dirt Chevron SR 1 grease for smooth roll Hi performance rust and oxidation inhibitors Bearings are precision high speed bearings manufactured to ABEC3 standards Seal is double lip seal Includes: bore double row angular contact bearing, (1) snap ring