6901-2RS Sealed Ball Bearings 12mm x 24mm x 6mm 6901-2RS Sealed Ball Bearings, the inner diameter is 12mm, outer diameter is 24mm and the width is 6mm, Bearings are made of Chrome Steel, each bearing has Double Shielded to protect the bearing from dust or any possible contamination. Bearings are packed 10 bearings in one plastic tube.