Like the name impliesHEVI-Hammer shotgun shells hit hard! HEVI-Shot loads this shotgun ammo with 85% premium steel shot, layered with 15% Bismuth shot. Bismuth is 22% denser than steel, which makes pellets penetrate deep, while the steel shot keeps patterns tight and costs down. Steel pellets are treated with dry film lubricants for enhanced resistance to corrosion. HEVI-Shot HEVI-Hammer Shotgun Shells are manufactured with premium hulls and a thick base wad for reliable operation in semi-auto shotguns; and higher brisance primers improve performance in cold weather. Flaxseed spacer above the shot load ensures a solid surface for crimping, and is bio-degradable. 85% premium steel shot 15% Bismuth shot Premium hulls Thick base wad High brisance primers Flaxseed crimp spacer