Billit aluminum, the sx350j mods are made to be as small as humanly possible...the a lit of intricate milling and I am getting a ....pile of orders so I'm not going to spend extra time doing a bunch of custom work on each one I'm just doing bead blasted or brushed finishes or 6 or 8 different cerakote colors. All the rest of the details will simply be done the best way possible. I'm taking orders starting at 5pm today, Monday, so if your gonna order shoot me an email, first come first serve!...except for chowder, he's always at the top of the list in my book !