Personal Defense Features Effective self-defense requires ammunition that provides consistent expansion optimum penetration and superior terminal performance. And HST(R) delivers. That s why it s already the duty load of choice for law enforcement officers throughout the world. Its specially designed hollow point won t plug while passing through a variety of barriers and the bullet jacket and core hold together to provide nearly 100 percent weight retention through even the toughest materials. Personal Defense Specifications Caliber: 9mm Luger +P Model: Premium Series: Personal Defense Bullet Weight: 124 gr Rounds Per Box: 20 Casing Material: Brass Bullet Type: HST Jacketed Hollow Point