These .22 Rimfire dummy rounds are 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 Azoom snap caps are totally safe and eliminate unnecessary risk. Tough solid aluminum construction and ideal for training, storage and function testing.