Naniwa makes an easy-to-use razor blade sharpening kit using the superior power of the Japanese water stone. Based in Osaka, Naniwa's reputation for creating the best, the "super stone water stone" is revered by blade owners worldwide. Just spray a little water and draw the knife up and down a few times, and you're as good as new. They're easy to clean and can be stored easily. Most first-time buyers buy the complete system: the stone, the stone holder, and flattening and dressing stone to keep the stone nice and sharp.