Review (3/5): Not quite what I expected
First of all, I'm a licensed nail tech and salon owner so my review is based on professional use.
These buffers are really tiny and really rough. I was planning to use them for beveling edges on natural nails but they are waaay to rough for that, even if I take an 80 grit file and try to soften them up, they're still too rough for the job. They're rough enough to use to prep nails for gel polish manicures (but not rough enough to prep for gel extensions, overlays or acrylics) or they could be used over a gel/acrylic overlay/extension to smooth things down, but I can do that with a 180 grit file anyway. The sponge itself isn't very soft either... So they aren't usable for natural nail services and they aren't really necessary for extension or overlay services either since I need a 100/180 file for those services anyway so why would I get out another single use tool for a job that I could complete with my 100/180 file that I already have out?...
So far they've only been useful for prepping plastic swatch sticks for swatching gel polishes and I still need buffers for my natural nail services... Maybe I could use them like tiny bits of sandpaper for woodworking projects? I hate having tons of a product that I can't really use so I'm going to have to get creative to find a way to use these up... They could be used to buff calluses but I don't offer pedicures at my salon, so if all else fails, they'll end up in a freebie jar for my salon clients so they can buff their own feet.