The 5 Gillette Mach3 men's replacement blades have been made for precision and comfort , equipped with a lubricating strip that glides to help protect the skin from redness and a protective microfin. Known for its advanced technology , the Mach3 name comes from the presence of three sharp blades that work in harmony to offer a precise and comfortable shave. These replacements are widely appreciated by men looking for a high-quality shave.