Corbon Pow'RBall is a high-velocity .357 Magnum self-defense load designed to deliver reliable feeding and consistent terminal performance. Each 100-grain Pow'RBall projectile features a gilding metal jacket with a lead core formed into a patented V-shaped cavity and capped with a round polymer ball that is crimped in place by the copper jacket. Specifications and Features: Brand: Corbon Ammo Cartridge / Caliber: .357 Magnum Bullet Weight: 100 grain Bullet Type: Pow'RBall (polymer-tipped JHP design) Muzzle Velocity: 1,450 feet per second Rounds Per Box: 20 Case Material: Brass Primer Type: Boxer Country of Manufacture: Made in USA