FR168-2RS Flanged Sealed Stainless Steel Ball Bearings 1/4" x 3/8" x 1/8" inch Lot of 10 Bearings FR168-2RS Flanged Sealed Stainless Steel Ball Bearings, this is a popular size that could be used in many application that uses this size 1/4" x 3/8" x 1/8" inch. each bearing is rubber sealed from both sides to protect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.