DevilCase ASUS Zenfone 2 (5.5 inches) Aluminum Alloy Protective Bumper (Zenfone2/TopBottom:Gold-Side:Red) 100% built by aircraft level of aluminum A6061 Precision CNC Machined Aluminum bumper and volume control key Internal Shock Absorption Pad Ergonomics Grip, Curved Line Design Compatible Model: Asus Zenfone 2