Ball Bearings 3/16"x3/8"x1/8" Lot of 10 Bearings High Quality 10 Ball Bearings , this is a popular size that could be used in many application that uses this size 3/16" x 3/8" x 1/8". Bearings are made of Chrome Steel and can rotate up to 49000 rpm, each bearing are rubber sealed from both sides 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.