  Frangible copper projectile. 
This projectile was described as nearly pure copper with a bit of nylon to hold it together.  "Frangible" means it's designed to fragment into thousands of little pieces on impact.  This serves two purposes: Increasing damage to the target (i.e. makes a bigger hole) and limiting the danger of the projectile bouncing around in an enclosed space and hitting the shooter. 
Source: Derek McKinley 
Contributor: Derek McKinley 
Acquired: 6 April, 2007 
Text Updated: 6 April, 2007 
Price: Donated 
Size: 0.5" 
Purity: >90%
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