10-Pack Sealed Bearings 5x10x4 MiniatureBall Bearings 5x10x4 Sealed Lot of 10 Bearings 10 Sealed Ball Bearings, this is a popular size that could be used in many RC wheel and motor applications that uses this size 5mm x 10mm x 4mm. Bearings are can rotate up to 60,000 rpm, each bearing has 2 Seals to protect the bearing from dust or any possible contamination, additionally, these bearings come pre lubricated with grease for smooth operation, Bearings are packed 10 bearings in one plastic