HEVI-Bismuth is 22% more dense than steel, which allows you to drop down a shot size for the same lethality. HEVI-Shot's bismuth is safe to shoot in modern and classic guns.
Specifications:

Gauge	10 Gauge
Type
Length	3.50"
Ounces	1 3/4 oz
Shot Size	4
Muzzle Velocity	1350 fps
Rounds Per Box	25
Boxes Per Case	10
Shot Type
Shot Material	Bismuth
Application	Hunting