These Micro Mesh Soft Pads are excellent when polishing frets, giving them a nice, clear mirror-like shine.
If you've done the job well, polishing the frets with 320, 400, 600, 800, 1000 and 1200 grit sandpaper, you only need to use the 1500 and 1800 to complete the process. That will produce a mirror-like reflection.
After that, the frets are a dream to bend and slide on!
I also use these when I make a Bone Nut from scratch, and I need to do the final polish on the top. Makes the nut look like a piece of glass.