The Titanium Utility Ring is not a wedding ring per se. But since I don't like man rings, and the only rings I've ever worn are wedding rings, it is a wedding ring to me.
It's made of titanium plates riveted with brass. It includes a bottle opener (YES!), a straight blade (which will be great for street fighting), a saw (for street tree chopping), a serrated blade (for impromptu street steak cutting) and a comb (for street moustache and/or pubes grooming). The only thing I miss: a welding gun.
It's $US50 well spent, if you ask me. [Cool Material]