It's made of kevlar and can stop small caliber rounds:
http://www.huffingtonpost.com/2013/05/07/bulletproof-cup-jeremiah-raber-nutshellz_n_3229322.html
http://www.huffingtonpost.com/2013/05/07/bulletproof-cup-jeremiah-raber-nutshellz_n_3229322.html
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