LOS217001 Precision Ball Bearing Hardware RC Upgrade Part 4x7x2.5mm 4 PCS
4x7x2.5mm Ball Bearing 4 LOS217001 Bearings All. 4 x 7 x 2.5mm Ball Bearing (4), LOS217001. – If you receive an item and it doesn’t work properly or you don’t like it for any reason at all.