Yep these are bearings...but the accuracy is terrible!!!! If you buy them for any (accurate) application, please look elsewhere :/ the center wiggles terribly, i hope they won’t explode when the routerbit is at full speed:/
2 out of 10 ball bearings came broken. No model number is engraved on the ball bearings, I had to write it next to the part manually. But hey, they were not expensive.