Shapton offers two lines of sharpening stones: the Ceramic on Tempered Glass (GlassStone) Series, and the Professional Series. The GlassStone series features a layer of the highest quality ceramic sharpening matrix bonded to a polished tempered glass base, whereas the Professional series features a homogeneous ceramic sharpening matrix. These quality stones do not need to be soaked in water; simply splash some on and start sharpening.