These .22 Rimfire dummy rounds are ideal for gun testing and shooter training. Not snap caps, but rather precisely dimensioned, functional dummies; A-Zoom Training Rounds are CNC machined from solid aluminum and hard anodized. A-Zoom .22 Rimfire dummies are widely used for hunter education and teaching safe firearms handling. Gunsmiths rely on them, too. When checking or adjusting the trigger pull use snap caps.