10 Ball Bearings for Yomega YoYos 10 bearings YoYo Ball Bearings for Yomega YoYos, Bearings are made of Chrome Steel and can rotate up to 71000 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.