If it's not plastic then it is certainly some of the softest metal I have ever encountered. Looking at both snapped off ends, if it's metal it's not like any metal screw that I've ever seen. The ease at which the head of the screw started stripping also has me scratching my head. I tried to drill it out but the drill kept traveling down the uneven break to the body. I probably should have tried slotting it first but I'm hitting the store today for strap locks for the pilot hole i've drilled right next to the broken screw :P
"No it doesn't surprise me you know origami. You know origami and play speed metal on 7 string guitars."
- my former boss