PTS SAPI Dummy Foam Plates Set (2 Pack).  A front and back plate set made to look like the real thing!  It's made of a flexible foam that looks real, but is very lightweight and bendable.  You get (1) FRONT and (1) REAR plate per pack.  The medium size is standard, which will fit in ALL tactical vests with an armor plate insert.  We tested them with the smaller JPCs and they worked great.  

Also will stop the impact of all BB hits.  You won't even feel them.

If you're looking for the best foam armor plate inserts set - this is it!