If you have the need for speed, the Yahiko True Grit stones are the stones for you. These are nice and hard ceramic stones. These stones cut fast and don't load very much since the ceramic abrasive has a nice binder that allows the particles to release quickly. They wear a little faster than the Shapton Glass stones that we also use quite a bit at the office. The lower grit stones in this line require a very quick soak of a couple minutes before using. The higher grit ones are splash and go.