Tungsten core golf balls. 
Golf balls?  Tungsten?  Lord knows what makes anyone think this would help them, but I guess if you're bad enough at the game, you'll buy anything.  I don't know if these actually have any tungsten in them: I sure can't find any.  It's possible there is a trivial amount of tungsten powder scattered in the rubber core.  It's on my list of things to test next time I visit the XRF machine. 
Source: eBay seller kidkayo 
Contributor: Theodore Gray 
Acquired: 19 August, 2003 
Price: $5.50/15 
Size: 2" 
Purity: 1% 
Sample Group: Golf Equipment
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