Gillette Mach3 5 Cartridges. 3 Blades specially positioned to extend gradually closer to your beard, to shave you progressively closer in a single stroke. So close there is less need to resave, which means less irritation. Patented comfort edges each blade has a patented DLC comfort edge, so Mach3 glides effortlessly and comfortably across your face. And Mach3 has an advanced Indicator lubricating strip with a blue stripe that fades away when you are no longer getting the optimal Mach3 shaving experience.