684ZZ Bearing 4X9X4 mm ABEC-5 (10 PCS) Miniature 684Z Ball Bearings 684 ZZ 618/4ZZ Hobby Emax Motor Quadcopter L-940ZZ Bearing

Smooth as new bearings and worked great in 2207 and 2306 motors

Delivered very quickly, looks to be a much higher quality than I expected. I used them for a front bearing on an E-Flite 480 electric motor, runs like new

Look for that 'Abec-5'. It's not that Abec-5 means they are the best made it's mid on the Abec scale. To me it means they are better for the money by a magnitude than all of the other bottom of the barrel bearings you are likely trawling through now hoping for fast shipping as a prime member. If a seller doesn't list where said bearings rate on industry rating systems then they are almost certainly low quality. Also these weren't much more $. In some or maybe most sizes of these small bearing packs here your not going to find any Abec-5 or they will be over 2x the price, sigh.........

Samsung powerbot r7070 could not find replacement parts anywhere. Bearing on brush was making alot of noise. Replaced with this bearing. Quiet and smooth with extras. Price is good.

Much better to buy these for cheap than buy a new motor for 25 bucks.

These were a perfect replacement for my busted and broken bearings in my iFlight Xing-E 2208 1800kv motors. Motors are now cooler and quieter.

Very happy with these bearings!

Half the bearings are grinding and sound loose. Sound like my worned out bearings are in still better shape than these ones.... Nonetheless, The seller provided me an unbeatable customer service. I still recommend doing business with them.

just as advertised