E13ctron are a brand new company that makes CNC'd aluminum cases for the iPhone 4. Their name is interestingly unique and comes from the word 'Electron' which is a subatomic particle, and the '13' is the 13th element that is aluminum. The E13ctron S4 case for the iPhone 4 is an absolutely stunning aluminum case. As you may already know, there are plenty of aluminum cases out there but the S4 stands out to be the most original by far. Combining two parts, a front and back which come together to form a case surrounding the iPhone 4. E13ctron lets you choose and customize the colors of both sides of the S4 to your liking from an amazing slew of colors. Catch the full review after the break!