Razor be used on both sides, with two open edges. The blade on the double-edged safety razor is slightly curved to allow for a smoother and cleaner shave. In 1901, the American inventor King Camp Gillette, with the assistance of William Nickerson, patented a new variation of safety razor with disposable blades. Gillette realized that a profit could be made by selling an inexpensive razor with disposable blades. This has been called the razor and blades business model, and has become a very common practice for a wide variety of products. Many other brands of safety razors have come and gone.
Razor whole straight-razor shaving kit can exceed the cost of even an expensive electric razor. Straight razors with open steel blades, also commonly known as cut-throats, were the most commonly used razors before the 20th century. Straight razors consist of a blade sharpened on one edge. The blade can be made of either high carbon steel, which is slower to hone and strop, and holds an edge longer, or stainless steel, which hones and strops quickly, but has a less durable edge. At present, stainless-steel razors are harder to find than carbon steel, but both remain in production. The blade rotates