Picked this up from Brooksie. very easy worked a couple blades with it. I don't need a coti anymore as I got a nice coti like edge with slurry a sharper coti edge with very light slurry and a very keen edge on water only. I did a few with chosera 1 5 10, suehiro 15k then Escher. This was the EASIEST natural stone I ever worked with. No wonder they are not out there cuz I wouldn't think I would ever sell this stone. Its not Jnat sharp but so easy. Im very happy with the edges on this one.