Sharp knives are safe knives: They require less force to use and do not slip. And in future, the Zwilling SharpBlock with KIS technology from the Four Stars series will take care of the optimum sharpness of your knives. The self-sharpening knife block protects your knives from damage and completely relieves you of the need to sharpen them by hand. So you don't have to worry about when is the right time to resharpen your knives and how to sharpen them properly.