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 razors.