Blue Aoto 2000x Water Stone. Measures 51.6mm x 73.5mm x 215mm (It's a big stone) and weighs 1500g. The feel of it soft and is a joy to sharpen on. The stone is listed as a 2000 grit but it has a mix of synthetic and natural material and allows you to further refine the bevel and edge between your medium grit stones and a final finishing stone. Very muddy stone. Requires a 5 minute soak.