Ultra Thin High-strength Aluminum Metal Bumper Case with Buttons for Apple iPhone 5 / 5s (Silver) Ultra thin (0.7mm) aluminum metal bumpers, the same material as iPhone origina. Inner spacer prevents bumper from contacting the iPhone. Securely wraps around the iPhone 5/5s Adds minimal weight - only weights 3 grams! Smart Buckle design, easy install and remove without any tools by hand.