Gillette mach3 men's razor blade refills feature stronger-than-steel blades that stay sharper longer. With sharper blades, it is engineered to last for 15 comfortable shaves. These Gillette razors feature a lubrication strip that glides to help protect your skin from redness and a microfin skin guard that stretches the skin and prepares hair to be cut. Mach3 men's razor blade refills fit all mach3 razors. Gillette mach3 gives a better shave than a new 2-bladed ordinary razor even after 5 weeks.