The Hornady 6.5mm Gas Checks are premium copper crimp-on gas checks designed for cast bullet reloading providing essential protection from hot gases and deformation with 1000 pieces per box.Hornady 6.5mm Crimp-On Gas Checks - 1000 countMade from high-quality copper constructionProtects cast bullets from deformation and hot gasesReduces barrel fouling and lead buildupBoosts performance of cast bulletsCrimps securely to bullet baseEssential for hunters and competitive shooters who reload their own ammunition these gas checks deliver the quality and craftsmanship Hornady is known for ensuring reliable performance and extended barrel life.