No matter the shape: box, flat, or rotary, Microplane's competition around the world are tools that have been made the same way for hundreds of years. The cutting edges are formed by punching holes into flat or curved stainless steel or tin. Files are made by grinding a rough edge that works by rubbing and tearing. Microplane tools tiny razor-like edges are different. They are formed by a totally different process called photo-etching in which holes are dissolved with a chemical, leaving edges that finely slice instead of tearing or shredding. Microplane Tools are better because they are sharp yet safe. Try one and expect a Miracle!