Rybtd 10 PCS Ball Bearings Frictionless Color Miniature Metal Bearings ABEC-9 608 2RS Couble Shielded Bearings Stainless Steel Bearings for Long Skateboards Four-wheel Skates Wheels（Black）

I needed some cheap-ish bearings for some prototyping work. The final product would be fully-kitted, but I just needed something for proof of concept. These things were spot on. While they won't be ideal for upgrading your skateboard or high-end RC buggy, they are perfect for getting your dummy runs up and running and testing to destruction. They actually performed better the I thought and I've used a few of them in a number of projects and they've outlasted some of the other hardware! If push comes to shove, you 'could' use them in a decent bit of kit. In an emergency. If you REALLY needed to!

The bearings work as needed, however i did notice that the plastic insert around the bearing became dislodged while removing another bearing from the packet, easyly fixed by pushing back in, but can't speak for the longevity of them as have only just started using them for 3d printed parts.Overall happy with purchase.

For the price they are good value, however as many other people have mentioned they come shipped from the factory covered in ridiculously thick, sticky grease which is so 'stiff' that you can't even rotate the bearings. They certainly don't spin. Exactly as other people have mentioned the first thing I had to do was to soak them in something like methylated spirit or isopropyl alcohol in order to try to dissolve this sticky grease, then re-oil with something more suitable. This takes a lot of time and effort - so be warned. Once you get them spinning they are ok for DIY projects & good value.

Once I had taken all the solid grease of the bearings, I had a lot more movement. Would buy again though.

Packed with very sticky grease but roll OK.

Have not used them yet. Have bought them to use with my 3D printer. Quality is good and they seem sturdy. Will update once I use them.

As other reviewers have mentioned, these arrive covered in grease and almost completely unusable. They do not roll freely at all. I dosed mine with a liberal coating of WD40 and they work okay now but definitely not a step you should have to take.

Used them for the roller on my Ender 3 and they roll nicely so no complaints