10-Pack 5x9x3mm Sealed 5x9mm Miniature Ball Bearing5x9x3mm Sealed Ball Bearings Pack of 10 Pre Lubricated Chrome Steel This set includes 10 high quality sealed ball bearings sized 5mm x 9mm x 3mm, ideal for compact, high speed applications. Each bearing is made from durable chrome steel and features double rubber seals to keep out dust, dirt, and moisture extending the life of the bearing and ensuring smooth operation. Pre lubricated with grease, these bearings are ready to use right out of the box.