The Gokumyo is the premium line of super-fine finishing stone from the top waterstone manufactuer Suehiro. While may not be a common choice for kitchen knife lovers, it is highly regarded by straight razor users because of their super uniform abrasive size and high hardness. The 20mm thickness as a superfine finishing stone will last you a very very long time.
The Gokumyo series comes with a large anti-slip rubber base, and a 1000/3000 grit flattening stone.
Size: 205 x 73 x 20mm