And they're much more expensive than the regular nipples (and worth every penny). I'm still trying to use up all my percussion caps before I send off my gun to be worked on, because I know I'll never touch a percussion cap again once I have the new nipples. Plus one of the cylinders is loaded still, and I'm definitely through with drilling and hammering bullets out. And it's been 1,000,000 degrees and/or raining every time I get a day off, and there are no indoor ranges around here.