Highly effective in both 410 compatible handguns and shotguns, the 410-gauge PDX1 Defender ammunition features a distinctive black hull and black oxide high-base head; it combines four plated Defense Disc projectiles and 16 pellets of plated BB shot.1 Penetration & Knock Down4 Plated Defense Disc Projectiles2 Massive Shock16 Plated BBs compensate for aim error