6801-2RS Sealed Ball Bearings 12mm x 21mm x 5mm Lot of 10 Bearings 6801-2RS Sealed Ball Bearings, a popular size that commonly could be used in many RC wheel and motorapplications that requires this size 12mm x 21mm x 5mm. Each bearing has 2 Seals toprotect the bearing from dust or any possible contamination, also bearings are pre-lubricated with grease.