The Tannerite Half Brick reactive targets are specifically designed to be safe and non-flammable whether sitting on a shelf being mixed or used. When shot they produce water vapor and a thunderous boom resembling an explosion for instant shot confirmation.Tannerite Half Brick Reactive TargetsFour 1/2 pound targets per packSafe non-flammable design for storage and handlingRifle targets for long-range shootingProduces water vapor and audible explosion when hitTrusted by hunters law enforcement and U.S. armed servicesThese shot indicator targets are the preferred choice for hunters law enforcement and military personnel who need reliable feedback for accurate shooting at distance.