The Underwood Ammo Xtreme Penetrator 9mm +P+ features advanced solid monolithic projectiles delivering exceptional performance with 1300 FPS muzzle velocity and 432 ft-lbs of energy.Underwood Ammo Xtreme Penetrator 9mm +P+ ammunition115 grain solid monolithic projectile designHigh-pressure +P+ loading for maximum performanceNickel-plated brass casing for reliable feeding and extraction1300 FPS muzzle velocity and 432 ft-lbs muzzle energy20 rounds per boxEngineered for maximum penetration and consistent performance this premium ammunition is ideal for self-defense applications where reliable expansion and deep penetration are critical.