Caliber: 40 Smith & Wesson - Bullet Type: Critical Defense - Bullet Weight: 165 GR - Muzzle Energy: 506 ft lbs - Muzzle Velocity: 1175 fps - Rounds per Box: 20 - Unaffected by thick and heavy clothing including denim and leather. FTX bullet delivers superior controlled expansion and large deep wound cavities over a wide range of velocities. Clean burning and stable propellants reduce recoil in lightweight handguns and perform consistently in all temperatures. Minimal muzzle flash protects night vision. Feeds reliably in pistols. Shiny silver nickel plating prevents corrosion and is easily visible in low light situations. Bullets are cannelured and crimped to avoid bullet setback. Bullets are custom designed for individual loads. The most effective consistent and reliable self-defense ammunition available today!