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depends on what there made of and what threat level there rated for
level 3
ballistic steel is 3/8"
ceramic is 3/4"
and poly is 1"
level 4
steel is 1/2"
ceramic is 1"
im sure there are thinner ones out there, but thats a good ball park figure
(my real level 4 stand alone ceramic plates are 1" and the pair weigh in at just under 10 lbs )
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