Naniwa Super Stone Super-Fine 10,000 Grit Japanese Whetstone Sharpening Stone, 21cm x 7cm surface (8.25"x2.75"), 2cm thick.
This super-fine stone is used for giving a knife a final polished edge. Recommended for sharpening razors and fine Japanese knives if you like a polished edge.
These are excellent stones, very reliable, forgiving, and not fragile. A GREAT choice for the beginner or casual home user who just wants good long-lasting stones that work great on a variety of knives. I use these SuperStone series at home and they're great.
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 are identical, and are the same size as the old Super Stones. The packaging you receive might say Super Stone (gray box as pictured) or it might say Sharpening Stone (orange box)... they are the same stones so don't worry!
Warranty: One-year warranty against manufacturing defects.