Law enforcement tactical professionals and those seeking the highest level of performance for self-defense will find the patent-pending combination of the NovX stainless steel case and poly/copper matrix projective delivers more power more velocity greater accuracy less recoil and more devastating terminal performance than ever thought possible. - Caliber: 40 S&W - Bullet Weight: 88 gr - Muzzle Energy: 580 ft / lbs - Muzzle Velocity: 1725 fps - Rounds Per Box: 20