Spring loaded alloy snap caps. Snap caps are ideal for dry firing and testing firing your firearm. Use snap caps to relieve tension on gun springs when in storage. Useful on older or more valuable guns. It will help maintain the health of your gun and make it have a longer life. Key Features Pair of alloy snap caps. 12, 16, 20 and 410 gauge available. Ideal for dry firing Use to relieve the pressure on the springs when your gun is in storage Particularly useful on older or valuable guns.