Every now and then we stumble upon some new kind of aluminum bumper, and as you know, we love us aluminum bumper cases. This one comes to us from an accessory company that calls itself GGMM. GGMM's Aviation bumper is CNC machined from a single block of anodized aluminum with anti-slip micro machined jimping to help with grip like we've seen on the Blade aluminum bumper. The Aviation is compatible with both iPhone 4 and iPhone 4S and was designed to have a simplistic slim profile with some interesting aspects. This is certainly not one of those aluminum bumper cases that will make you drool out of curiosity, though it has its own charm and is one of the most affordable all-aluminum bumper we've seen to date at around $25. 

You can grab one in 7 different colors if you head over to eBay.