MR74z 4x7x2mm Open Miniature Bearings ball Mini Hand Bearing Spinner 10pcs/Set
Air Compressor Reed Valve Kit For Porter Cable For Craftsman DeVilbiss KK-4275. These balls or rollers “bear” the load, allowing the device to spin smoothly. It’s suitable for RC Cars,Boats,Robots,Bicycles,Toy,Fishing,etc.