Naniwa Super 1K/5K Combo Stone

This Naniwa Super stone combines their two most popular stones in one. The dark blue side is the 1K stone and the pale blue side is the 5K stone. It's a great way to save some money to buy a combo stone when you're first learning to sharpen. Dimensions are 210 mm x 70 mm x 20 mm. The stone is easy to use: just splash water on it and you're ready to go (Naniwa does not recommend soaking).