Ball Bearings 3 x 8 x 3 Stainless Steel Lot of 10 Bearings High Quality 10 bearings Stainless Steel Ball Bearings, this is a popular size that could be used in many application that uses this size 3 x 8 x 3. Bearings are made of Stainless Steel and can rotate up to 54,000 rpm, each bearing has 2 metal shields to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease, Bearings are packed 10 bearings in one plastic tube.