Naniwa 1000/3000 Whetstone
This is a fantastic stone from Naniwa to sharpen your knives.
Soak them in water for 10 minutes before use. The packaging doubles as a holder for the whetstone to sharpen on.
Begin sharpening your knife on the red side (1000 grit) and finish on the green side (3000 grit).
Size: 185 X 65 X 15 mm each stone