Snap caps are made to protect your firearms by relieving the stress on your firing pins and firing pin springs. Traditions Snap caps are also a great tool to practice dry firing your guns to teach safe gun handling, improve your shooting skills and tune your trigger.
Specifications:

Type	Snap Caps
Caliber or Gauge	17 Hornady Magnum Rimfire/22 Winchester Magnum
Rounds Per Box	12
Material	Aluminum
Chamber