10-Pack 61801-2RS Bearings 12x21x5mm Sealed Outer Diameter - 6 1/8 inch (6.125") CSCF060 bearing has Brass balls

CSCF060 bearing has Brass balls retainer

LME122232AJ NB Clearance Adjustable Bearing

LME80120165AJ NB Bearing

CSK30-2RS One-way clutch Sealed Bearing

or small electric motors

10-Pack 61801-2RS Bearings 12x21x5mm Sealed Outer Diameter - 6 1/8 inch (6.125") CSCF060 bearing has Brass ballsBall Bearings 12x21x5 Rubber Seals Lot of 10 Bearings 10 Ball Bearings, this is a popular size that could be used in many RC wheel and motor applications that uses this size 12mm x 21mm x 5mm, features dual rubber seals for enhanced protection against dust and contaminants, additionally, these bearings come pre lubricated with grease for smooth operation, Bearings are packed 10 bearings in one plastic tube. Double Sealed Ball Bearings 61801RS