This shotshell is a non-firing 12 gauge 2 3/4″ 1 ounce shell that has the heft and feel of a real 12 gauge shell without the primer and powder. These are great for gunsmiths, gun training for new shotgun shooters, and for competitive shotgun shooters like 3-Gunners who want to practice loading and manipulating their shotguns without using live ammo.