Made in Japan.
Naniwa "New Super Stone" coarse 400 Grit Japanese Whetstone Sharpening Stone, NO Stand, 21cm x 7cm surface, 2cm thick.
This coarse stone is perfect for grinding a new edge on your knife, and for working out nicks or cracks or other imperfections in old used/abused/damaged knives. Use this grade only when you regular maintenance and finishing isn't doing the trick anymore. It's quite coarse and so will cut (remove metal) quite aggressively and quickly. Note: these are the new (for 2015) "Sharpening Stone" series from Naniwa which replace the old "Super Stones". They have different packaging, but the stones themselves look and feel very, very similar, and are the same size as the old Super Stones.
They are still very much high-end stones but are one step down from the top of the line Chosera (now rebranded "Professional Stones") which use a different bonding method for a somewhat nicer feel and faster cut, but at the expense of higher prices and more fragility. I use the SuperStone/Sharpening Stone series at home and they're great.