I made that thing for my dear friend. She was a punk pierrot at the party last weekend. I'll show you photos of her if I only get some, by the time I'm showing you my brother in his bath instead. The collar is made of leather, pins, string and wire; spikes are wooden.
It doesn't fit my brother well, too narrow neck he's got. It looks a lot better on my friend, when the leather strap is drawn.