Garrett Timmerman wrote a review of Toko Edge Grinding Rubber on January 31, 2008
This is a must after any edge tuning...polishes them up very nicely. I suggest using a fining stone very lightly before this, but then doing a full buff with this. Also, this won't work well for de-tuning (use a stone), but helps smooth things out afterwards. If you're gonna bother tuning your own edges, do it right and don't try to finish with a file.