Shapton Glass Stone Seven: sharpen in style, even on the road
The Shapton Glass Stone Seven are stunning Japanese sharpening stones. The stones look a lot like the 'regular' Glass Stones. Compared to what you might expect from this name, you don't sharpen on glass. You sharpen on a top-quality Japanese water stone that has been enhanced with a glass sheet to make the whole stronger and for more grip.
With these stones you also quickly remove a lot of material. The difference can be found in the size of the stones and the thickness of the layer of sharpening particles. That thickness is namely 7 mm, which is 2 mm more than the HR and HC Glass Stones. That is also where the Glass Stone Seven (also called G7) got its name from.