4-Pack 6006-2RS Bearings 30x55x13mm - Sealed Ball Bearings6006 2RS Ball Bearings Pack of 4 Rubber Sealed 30mm ID x 55mm OD x 13mm Wide Compact, sealed bearings for high speed systems This 4 pack of 6006 2RS deep groove ball bearings is built for smooth and quiet rotation in motors, wheels, and general purpose machinery. Each bearing is made from durable chrome steel and sealed on both sides with rubber to block out contaminants while keeping grease inside. Pre lubricated and ready to go, these bearings are