Lot of 50 bearings Ball Bearings size 3/16" x 1/2" x 0.1960", Metal Bearings 0.1875" x 0.5000" x 0.1960", this is a popular size that could be used in many Radio Control Cars and trucks, anything that uses this size 3/16" x 1/2" x 0.1960", Bearings are packed 10 bearings in one plastic tube.