This is a New/Never used 5"x8" Impac ST (Special Threat) trauma plate. On it's own, it apparently will take (and Stop) multiple hits from any caliber from .25-.45 auto and 357 Sig.
Purchased for $90 2 years ago, Asking $40 FTF in Riverside, or $45 shipped via Priority Mail. Thanks. -Jack
NOTE: This plate is not made of Kevlar, and does not "expire".
EDIT* TRADES: I'd also trade for two (2) boxes factory 9mm ammo, or the same in 45auto (plus a few bucks on my end for the latter).
Cool video about a similar Protech Plate: http://www.youtube.com/watch?v=R8ZXTlHmTZE