I bought two more packs of 30 for a lot of money. These are just as good. I mainly used rollers for 3D printing. They work perfectly for this purpose. Okay, I'll wipe off the outer grease. I was concerned that I might need very little resistance for the coil rollers. But a little resistance actually helps. They are near perfect with factory lubrication. After there were too many of these, I 3D printed some spinners. They are also good for this purpose. They don't spin well with lube. If you just hand wash them in the sink with soap and water, they spin very well. I've removed the metal sides to make it even cleaner, but you'll see little benefit from the trouble. The same goes for adding oil or Teflon. The drop helps calm the rotation. I should have bought that first.