3 Blades with advanced Anti-Friction coating for a close, comfortable shave, even when shaving against the grain. Soft, protective Microfins gently smooth down the skin so Mach3Turbo can shave evenly and effortlessly. Enhanced Indicator lubricating strip: when the green fades way, change the blade for a better shave. All Mach3 cartridges fit all Mach3 razors.