I recently purchased a drum sander that came with only the sandpaper that was on the drum. I have a bunch of hardwood that I planed down and wanted sanded. These sanding rolls are easy to change out, using the instructions, and last quite a long time. I got three different grits to use in stages to get the finish I prefer. I am very pleased with the rolls and will getting more as I need them. Grizzly sanding rolls are considerably less expensive than most other major brands.