Editing Safety razor (section)

=== Double-edged razors ===
[[File:Knockout-Bakelite-Rz.png|thumb|A three-piece British 'knockout' safety razor made from [[Bakelite]] and steel, probably from between 1930s–1950s]]

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]]". Double-edge razors are still designed and produced in many countries, and in 2010, [[Procter & Gamble]] estimated that almost a billion men were shaving with double-edge razors.<ref name="guard-factsheet"/> Better known manufacturers include Edwin Jagger, Feather, iKon, Lord, Mühle, Merkur, and 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.<ref>{{Cite news|url=https://www.primandprep.com/interview-with-parker-safety-razor/|title=Interview with Deepak Grover & Howie Woda of Parker Safety Razor|date=2018-11-12|work=PrimandPrep|access-date=2018-11-29|language=en-US|archive-date=16 November 2018|archive-url=https://web.archive.org/web/20181116215834/https://www.primandprep.com/interview-with-parker-safety-razor/|url-status=live}}</ref> 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,<ref>{{Cite news|url=https://blakenblade.com/what-does-open-comb-razor-mean/|title=What does open comb razor mean? The difference between open and closed comb razor|date=12 October 2016 |publisher=Blake'n Blade Shave Shop|access-date=2019-12-31|language=en-US|archive-date=31 December 2019|archive-url=https://web.archive.org/web/20191231154124/https://blakenblade.com/what-does-open-comb-razor-mean/|url-status=live}}</ref> 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).{{cn|date=November 2022}}