"Great product! Same as magazines that Beretta has, but less than half the price (Beretta charges $55/magazine). I have owned 2 of these for the past 6 months and had no problems with them at all. I have the Beretta CX4 and did the PX4 conversion and these mags fit perfectly and rarely jam! Went from 10 rounds to 17.Note: Indication markers at 4, 6, 8, 10, 12 & 14"