Ball Bearings 5x10x4 Seals Lot of 10 Bearings Pack of 10 5x10 Ball Bearings, 5x10 Bearing is a popular size that could be used in many application that uses this size 5mm x 10mm x 4mm. 5x10 Bearings are made of Chrome Steel and can rotate up to 49000 rpm, each bearing 5x10 has 2 seals to protect the bearing from dust or any possible contamination, also 5x10 bearings are pre-lubricated with grease, Bearings are packed 10 bearings in one plastic tube.