Dry fire any .22 LR Rimfire firearm safely and without chamber damage. Packed in handy 24 packs, these Pachmayr snap caps are precisely molded from a resilient polymer for many safe, damage-free hammer drops. After extensive experimentation and testing, these tough, polymer snap caps are proven to deliver long life and many hammer drops. In fact, testing has shown that these snap caps can withstand up to 5-times as many as hammer drops as the other "disposable" rimfire snapcaps.