9 magazines total

17 round capacity
flush fit extended capacity compared to oledder 15 round variants. 
Designed for beretta 92 series including the 92FS, M9, M9A1, M9A3, M9A4, 92A1, 92X, and 90-Two
It will also fit and function perfectly in the Beretta Cx4 Storm Carbine

20 each or obo