CCI calls them "22 Long CB caps", looks like "CCI0038" is the part number; that's all I've used but that gives you an idea of what to look for. Can't see the box I have near to hand, things are a bit of a mess here but that will find you the right thing. Low velocity but clear rifle barrels nicely and will poke holes in things, just not enough "oomph" to kill anything large.