The Underwood Ammo Xtreme Penetrator 9mm +P features 115 grain solid monolithic projectiles designed for superior penetration and terminal performance with 1250 FPS muzzle velocity and 399 ft-lbs of energy.Underwood Ammo Xtreme Penetrator 9mm +P Ammunition115 grain solid monolithic projectile constructionHigh-velocity +P loading: 1250 FPS muzzle velocity399 ft-lbs muzzle energy for maximum stopping powerPremium nickel-plated brass casings20 rounds per box for convenient packagingEngineered for law enforcement self-defense and demanding applications where consistent penetration and reliability are critical. The solid monolithic design ensures consistent performance and deep penetration through barriers.