Here’s a refill set of 3M micro-fine non-woven reed sanding & polishing cloth. The coarsest of the sheets is 600 grit (30 micron), and it goes all the way down to 14,000 grit (1 micron). Why so fine? Well, I’ve found that once you’ve got a great reed, polishing it will keep it in top condition longer! If your reed is feeling a bit meh, polishing it may bring it back to life.
Some folks have asked what “non-woven” means. Well, they’re produced by 3M, and as you can see here (sort of), they are various thicknesses and fiber density.