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.
Straight razor curved lower part of the main blade from the shank to the cutting edge is called the "shoulder". The point where the shoulder joins the cutting edge is called the "heel". The endpoint of the cutting edge at the front of the blade, opposite to the "heel", is called the "toe". A thick strip of metal running transversely at the junction where the main blade attaches to the shank is called the "stabiliser". The stabiliser can be double, single, or can be absent in some razor models. The first stabiliser is usually very narrow and thicker and runs at the