We use all aluminum construction in each Channel Letter we make. Though aluminum construction costs slightly more, it has many advantages over steel constructed Channel Letters. Aluminum letters will never rust. Aluminum letters are also lighter than steel and will require less mounting fixtures to be installed onto your roof or wall. Once the channel of the letter is built, LED's are installed, then the colored letter face is attached to the front of the letter. Each letter is then properly wired to a power unit located in the raceway or remotely, behind the wall, depending on mounting method selected.