623-2RS Sealed Ball Bearings 3mm x 10mm x 4mm Lot of 10 Bearings 623-2RS Sealed Ball Bearings, Bearings are made of Chrome Steel, each bearing has 2 seals 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.