Ergonomic: The short thumb handle with an ergonomically bent thumb ring provides for a comfortably relaxed position of the body during work. In addition,your thumb rests in a freely movable thumb ring insert.Thus,unpleasant friction and pressure points are avoided. Sharp: Convex blades with integrated cuting adges, hollow grinding and honing make the CP4 as sharp as a razor and ideal for slicing. Precise: With the patented screw,the tension is adjusted exactly and in a particularly sensitive way.