A-Zoom Shotgun snap caps for safety training, function testing or safely decocking without damaging the firing pin. CNC-machined from solid aluminum to precise cartridge dimensions, then hard-anodized for smooth functioning and long life. Each round has A-Zoom's durable "Dead Cap" proven to withstand over 3,000 dry fires while protecting the firing pin. Specifications: 20 Gauge Aluminum 2 Pk