The RWA 12g Co2 Capsules are made specifically for recreational sports use. They can be used with airgun, paintballs, and airsoft, especially with Co2 airsoft pistols or the Wolverine Wraith M4 Stock. These 12g metallic capsules are Co2 cartridges that allow you to shoot in rapid succession, without having to manually pump between shots. The pack includes 7 capsules for reliable and consistent performance.