3 Blades...specifically positioned to extend gradually closer to your beard, to shave you progressively closer in a single stroke. So close there is less need to reshave, which means less irritation. Patented DLC (tm) 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. All Mach3 cartridges fit all Mach3, Turbo, Power, Venus, Devine handles. Cartridges vacuum sealed for your convenience.