The Hornady .375 Caliber Gas Checks are premium copper components designed to enhance the performance of cast bullets for 1000 rounds of reloading applications.Hornady .375 Caliber Gas Checks - 1000 count per boxMade from high-quality copper constructionCrimp-on design for secure attachment to bullet baseProtects cast bullets from deformation and hot gasesReduces lead fouling buildup in barrelCompatible with .375 caliber cast bulletsEssential for hunters and competitive shooters who reload their own ammunition these gas checks provide reliable protection and improved accuracy while extending barrel life through reduced fouling.