These weighted 12ga shotgun snap caps (dummy rounds) have the same feel and weight as a live round which makes them perfect for practicing reloads for competitive shooting events, like 3-Gun. A spring loaded striking area cushions and protects the release of the firing pin which makes these an excellent tool for teaching and eliminating flinching as well.Features:Prevents damage and prolongs main spring life.Precision machined to true SAAMI specs.Primer material is correct hardness to prevent striker/firing pin over-protrusion.Aluminum won't damage the chamber/extractor/ejectorPackages of 5 snap caps are bare minimum for training with multiple magazines for pistols.Snap Caps are a critical training aid for learning how to fix malfunctions quickly and efficiently not only for competition shooters but for anyone who has a gun for self-defense.