Sackorange 608 ZZ Skateboard Bearings, Double Shielded,8x22x7 Miniature Ball Bearings（Pack of 20)

Like others mentioned, these come packed in grease and nicely stacked in tubes. Once you spray a dab of WD40 on them they spin very freely and the dimensions are accurate from what I can see. I did receive one that was slightly damaged but the rest were all good. I would buy these again.

Was swapping these into a 1/5 rc car and out of the 20 I was lucky to get 6 that werent gritty. Well see how long they last but next time Ill spend a bit more and get some from a company that has some better tolerances. After blowing out the grease and re-lubeing they got a bit better but still not as smooth as I am used to. Plus side, they dont chirp but thats about it. Update - 7/31/21 - They chirp. Got gritty quick and not smooth. Look elsewhere.

Seems to be solid standard 608 bearings, though they are packaged with heavy grease an do NOT spin freely. You have to take time an resources to properly clean them out with a solvent before RE-greasing or oiling them. Out of the box, they are stiff to roll an notchy. Once I put them in a sonic bath an regreased them, they were fine. Much like standard mid-quality sk8 bearings. For the price, sure, theyre fine enough for skating, but for 3D print applications, they are not plug n play, you need to coddle them, therefore, I took a star or two off the score. Better off going to your nearest skate shop for ready to ride bearings.

I don’t know much about bearings but from what I’ve gathered, these are commonly used with 3D printed parts for printer upgrades. I figured I’d buy a set for filament storage and a filament guide. So far, these are doing just fine. I followed the advice of other reviewers and used a liberal amount of WD40 to get these in working order. I soaked a shop towel and put these in a ziplock bag overnight and the gunk previously seized these bearings is now gone.

I had several damaged bearings that could hardly turn and one where the shielding came off completely. Minor issues are the outer diameter is small by about 0.5mm and they wobble quite a bit. I use these for little 3D printer project but I doubt I would ever put these on a skateboard.

These bearings dont seem to spin as freely as I hoped. Not sure if its due to the amount of lubrication but these are not smooth at all. For example you could use them in a fidget spinner but dont expect it to actually spin. Very tight so for that Im rating it lower.

good price, bad quality,

Used these in a small lawn windmill. Only needed 2 but have plenty of spares.

Great service

I purchased these to use in 3D printed components. Many reviewers commented on how they dont spin freely and some feel gritty. Bearings are made to bear a load and allow it to spin smoothly, and for this they work fine. I am using them for 3D printed projects and havent been disappointed yet. For skating I would recommend spending more and buying a set of quality skate bearings - I have a set of quality skate bearings Ive been rolling on since 2012 (~8 years now). Youll feel the low quality with every roll, I wouldnt count on these to either last as long or be anywhere near as quick and smooth as name-brand skate bearings, but theyre significantly cheaper and almost disposable while still offering a relatively frictionless roll compared to plastic-on-plastic that keeps my designs from wearing out prematurely.