Zenfone 2 5.5 inch Case, Emarket Aluminum Metal Frame Bumper Back Case Cover For ASUS Zenfone 2 5.5 inch ZE550ML ZE551ML Blue Color Quality material, shock absorbent, shatterproof, and anti-scratch material Help to Protect the back side and hold the phone tightly Complete Edge Protection with thickly four corner prevent getting impact easily Made of Aluminum removable,Easy to install. No tools Needed