Gillette MACH3 men's razor blade refills feature stronger-than-steel blades that stay sharper longer (vs Sensor3). With sharper blades (first 2 blades vs Sensor3), 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 microfine skin guard that stretches the skin, and prepares hair to be cut. MACH3 men's razor blade refills fit all MACH3 razors.