Aesthetics and Mechanics are the fundamental design ingredients of "DRACO IV". "DRACO IV" is a CNC Machined Billet using the same grade of aluminum that airplanes, bicycle frames, and other highly stressed structural parts are made with. The amazing contours and curve lines of "DRACO IV" is a masterpiece of craftsmanship with ergonomics engineering design for absorbing impact and distribute the energy around the bumper to protect your iPhone4/4S.