Ball Bearings 5x11x4 Sealed Lot of 10 Bearings 10 Sealed 5x11 Ball Bearings, this is a popular size that could be used in many RC wheel and motor applications that uses this size 5mm x 11mm x 4mm. Bearings are can rotate up to 55,000 rpm, 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.