The Tannerite Brick Reactive Targets are specifically designed to be safe and non-flammable during storage mixing and handling. When shot they produce a water vapor and thunderous boom resembling an explosion for immediate shot confirmation.Tannerite Brick Reactive TargetsFour 1-pound targets per packSafe and non-flammable designProduces explosive sound and water vapor when shotDesigned for rifle shootingPreferred by hunters law enforcement and U.S. armed servicesThese shot indicator targets are the choice of professionals and enthusiasts who need reliable feedback for accurate shooting practice and training exercises.