Ball Bearings 7x13x3 Lot of 10 Bearings 10 bearings Wheel Ball Bearings for many applications, this is a popular size that could be used in many RC Cars and Trucks, or any application that uses this size 7mm x 13mm x 3mm. Bearings are made of Chrome Steel and can rotate up to 50000 rpm, Bearings are packed 10 bearings in one plastic tube.