Hevi-hammer has 15% high density bismuth layered over 85% steel pellets.The bismuth layer is the same shot size as the steel.That small but mighty leading edge of bismuth packs nearly 50% more knockdown power than the steel layer at 40 yards.Shot Material: Steel BismuthGauge: 20 GaugeLength: 3Ounces: 1 ozShot Size: 3Muzzle Velocity: 1325 fpsRounds Per Box: 25Boxes Per Case: 10Application: HuntingHazair: Yes