They're Canadian military surplus.

I haven't torture tested the stove but it's made of Titanium and when I was prying the legs off of it with a pair of pliers and the can opener off my Swiss Army Knife, it didn't flex or complain once...I'd be willing to guess I could stand on it with little to no ill effects. Filing the burrs off with an axe file was quite a challenge too...Titanium is tough stuff! The bottom is slightly domed outwards as well which would add quite a bit of strength.

An unmodified one can be flipped upside down to use as a Esbit tab stove (the legs and the pot stand are identical top and bottom). Officially Vargo doesn't support that use but I've heard it works well. I haven't tried because I have the canteen stove and don't want to muck up my Vargo too much if I don't have to.