Carlson's Snap Caps are made from high strength aluminum for repeated use. A spring-loaded primer plunger prevents firing pin damage during dry-firing exercises. Note: Leaving guns cocked during storage is hard on springs and is dangerous. These snap caps will help keep your firearm in good maintenance free condition.|.5|4|1|8|Spring loaded striking area cushions and protects firing pins|Helps eliminate flinching while shooting|Protects the firing pin or striker|Manufactured to SAAMI spec using aluminum||||F|N/A