Hevishot Hevi-Bismuth Waterfowl 410 Gauge 3" 9/16 Oz 4 Shot 25 Bx/ 10 Cs HEVI-Bismuth Waterfowl shells Utilize Bismuth, Which Is 22% denser Than Steel, To Deliver More Downrange Lethality at An Affordable Price. And, Its Safe For older Fixed Choke And Fine Classic Doubles shotguns. Gauge: 410 Gauge Length: 3" Ounces: 9/16 Oz Shot Size: 4 Muzzle Velocity: 1300 Fps Rounds Per Box: 25 Boxes Per Case: 10 Application: Waterfowl