International Clays gunpowder is the second in the "Clays" gunpowder series of powders, bringing this technology to the 20 gauge reloader. It also works in 12 ga., 2 3/4" light, medium and heavy 1 1/8 oz. loads, and high velocity 1 oz. As with Clays gunpowder, clean burning and flawless functioning is the rule.