This is 12 Ga. Winchester Supreme Elite 3 1/2" 1 5/8oz #B Steel Shot. Winchester Supreme Elite Xtended Range Hi-Density Waterfowl shotshells combine patented high density shot and Drylok Wad Technology to create the ultimate in waterfowl hunting success. The advantages of Xtended Range Hi-Density shot include - it is non-toxic & 55% higher density than steel shot, harder hitting & deeper penetrating, and consistent shot shape results in highly consistent patterns. Plus, the high density shot is softer than most shotgun barrels and chokes. This ammo comes packed in 10 round boxes.