The Winchester Super-X Shotshell 12 Gauge 1 oz 3in Centerfire Shotgun Slug Ammo, 15 Rounds, X123RS15VP Gauge: 12, Number of Rounds: 15, Shotgun Shell Length: 3 in, Muzzle Velocity: 1760 ft/s, Ammunition Application: Big Game, Deer, Hunting, Included Accessories: None, Shot Material: Lead, Primer Location: Center fire, Bullet Type: Rifled Slug (RS), Cartridge Case Material: Brass, Lead Free Ammunition: No, Gun Type: Shotgun, Muzzle Energy: 3010 ft-lbs, Shotgun Shot Type: Buckshot, Shotgun Shot Weight: 1 oz.