I couldn’t resist the title! I had to see what this round was. The 20 round box is their typical Blue and is almost 12ga shotshell size with an insert for large (up to .50 cal) pistol rounds. the 9mm look lost. The end label reads.
The cartridges are loaded in Starline 9mm+P brass with a very ordinary looking truncated 124gr non-magnetic bullet.
What makes these so special, except the name? Nothing about them appears to justify the title of “Penetrator”.
I’ve checked their website and it is no help.
Appears just a way to charge $1.25 for a $0.60 cartridge.