The first time you know there's something special about the AL13 Aerospace Aluminum iPhone 5 bumper (US$59.99) from Designed by m is when you open the plain cardboard box. Slide off the top, and inside you find a slender, aircraft-grade aluminum (13 is the atomic number of aluminum, by the way...) bumper and a packet containing a screen protector.
We've reviewed a ton of aluminum bumpers for the iPhone 5 over the past year, but just about all of them require some sort of special tool to install or remove the bumper. That's not true of the AL13, which features a slide cover -- like that on the brushed-aluminum box -- for assembly and removal.
To install the bumper on the iPhone 5, you simply slide off the back, drop in the iPhone and then slide the back onto the bumper again. The inside of the AL13 features a thin liner to keep the bumper from scratching your precious phone, and there are precise cutouts for all of the various buttons and ports on your device. The edges are chamfered to match the general design of the iPhone 5, and the only ornamentations added by Designed by m are a tiny circled "m" logo on one side of the case and a diminutive AL13 logo on the other side.