It doesn't actually inject the pure goodness directly into your bloodstream (although it should), but it does let everyone around you know you're addicted (if they know what the hell a caffeine molecule looks like). It's 1.5" wide and both it and the chain are sterling silver. It runs $85, which is more than I expected. You have to be careful with stuff like this though. It could actually be the molecule for something like meth or coke. Like this Chinese tattoo I got on my ass-cheek. The dude swore it meant "100% Tough Guy", but it turns out it actually reads "Enter Here".

Caffeine in a Necklace [uberreview]