I have two Guangxi hones.They both came from the same supplier and they both were advertised as 12K stones. One stone is what most folks describe as a CNAT. It is grey. It is hard. It produces a fine white slurry that can be used to finish a razor. The other is a yellowish grey. It is fairly soft. It produces a thick, yellow mud that I find more suitable as a prefinisher than a finisher. That is the problem with Chinese naturals. You never know what you are going to get. If you get a good one, it is a real bargain.