  Tungsten-weighted dart. 
People who play darts care about exactly how much their darts weigh, and how that weight is distributed along the shaft of the dart.  They also care about air resistance.  Tungsten is a natural choice of material to make the body of the dart out of, because it's very dense.  This allow you to put a lot of weight exactly where you want it without introducing a lot of extra air resistance.  Or you could get a life. 
Source: Walmart 
Contributor: Theodore Gray 
Acquired: 10 February, 2007 
Text Updated: 10 February, 2007 
Price: $15 
Size: 5" 
Purity: 90%
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