thanks so much everyone, It truly is an amazing stone! it is soo smooth and did such an amazing job finishing my razor yesterday. the shave was incredibly close and the edge was ever so smooth and forgiving. This coti is with me for the long run I actually found out that most cotis are sold with 8mm depth even when bought new so I guess im good for a lifetime which makes me very happy. I had a great edge from my j-nat as well but it was much much harder to use than the coti. thanks again everyone