page_title: Safety razor
section_title: Double-edged razors
hierarchical_section_title: Safety razor / Variants / Double-edged razors
caption_attribution_description: English: A 'Knockout' three-piece safety razor probably from the 1930s, '40s, or '50s
context_page_description: A safety razor is a shaving implement with a protective device positioned between the edge of the blade and the skin. The initial purpose of these protective devices was to reduce the level of skill needed for injury-free shaving, thereby reducing the reliance on professional barbers.
  Protective devices for razors have existed since at least the 1700s: a circa 1762 invention by French cutler Jean-Jacques Perret added a protective guard to a regular straight razor. The first known occurrence of the term "safety razor" is found in a patent from 1880 for a razor in the basic contemporary configuration with a handle in which a removable blade is placed.
  Safety razors were popularized in the 1900s by King Camp Gillette's invention, the double-edge safety razor. While other safety razors of the time used blades that required stropping before use and after a time had to be honed by a cutler, Gillette's razor used a disposable blade with two sharpened edges. Gillette's invention became the predominant style of razor during and after the First World War, when the U.S. Army began issuing Gillette shaving kits to its servicemen.
context_section_description: Double-edge (DE) safety razors remain a popular alternative to proprietary cartridge razors, and usually offer significantly lower total cost of ownership since they are not marketed under the "razor and blades business model". DE razors are still designed and produced in many countries. Better known manufacturers include  Edwin Jagger, Feather, iKon, Lord, Mühle, Merkur, Weishi with several of them producing razors that are marketed under other brands. Often different models of razors within a brand share the same razor-head designs, differing primarily in the color, length, texture, material(s), and weight of the handles. Three-piece razors generally have interchangeable handles, and some companies specialize in manufacturing custom or high-end replacement handles. The butterfly safety razor utilizes a twist-to-open mechanism head to make changing the blade easy and convenient.  Variations in razor head designs include straight safety bar (SB), open comb (OC)(toothed) bar, adjustable razors, and slant bar razors. The slant bar was a common design in Germany in which the blade is slightly angled and curved along its length to make for a slicing action and a more rigid cutting edge.
  A primary functional difference between double-edge razors and modern cartridge razors is that DE razor heads come in a wide array of aggression levels (where aggression is commonly defined as being less protection from the blade).
caption: A three-piece British 'knockout' safety razor made from Bakelite and steel, probably from between 1930s–1950s
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