You've heard of lead, steel and bismuth: now try copper! This material is particularly effective for hunting, giving a high lethality for game, even at long range. The EXTRA Copper cartridge contains a container wad specially designed to protect the barrels from copper. Steel pellets proofing is required. Available in 12-gauge, several pellets numbers are available: 3, 4, 5 and 6. The 33-gram load provides significant stopping power without sacrificing shooting comfort.