Halo and high quality plastic.
Well folks I can pretty much guarantee you're not going to accidentally break your HALO slamming into a bunker...I just swapped out my new blue body. While disassembling the HALO one of the screw head was stipped (don't ask me how I certainly don't remember doing it). The only bolt in there was the one by the lid. I say what the hell and decide to just break it (i dont need the body anymore anyways and I am certainly not one known for his patience) It took a significant amount of force to bend it at all let alone get it to snap. Being the genious I am I managed to break a capacitor off the board and lose the anti-jam spring. Amazingly it still turns on and I didn't know it could spin that damn fast...
to the point, You guys aren't by anychance going to be selling the upgrades at IAO are you?
paintball equipment beware... the butcher is here