Topic summary
Razor blade
Extracted from the Wikipedia article Razor.
Cartridge razors
Exploiting the same razor and blades business model as pioneered in the early 20th century, cartridge razors were developed in the 1960s and are now the most common form of shaving in developed countries. Although designed to have a more ergonomic shape at both the handle and head (including commonly a pivoted head which keeps the blades angled to the skin at a predetermined angle through the shaving motion), the concept is very similar to that of the double-edge razor. However, here, the entire head assembly (a cartridge) is removed and disposed of, not just the blade. It is also common for these cartridge heads to have multiple razor blades set into them, commonly between two and five blades.