As a parent, how would you feel about finding these items in your house? These are about the size of .22 cartridges. It says 'cartridges for low velocity tools'. That's like an airgun, right? I would be very unhappy to find fireworks hidden under my couch, so I'm very unhappy to find these. What I don't know is if this is cause for concern merely like firecrackers (a talking-to), or dangerous, like bullets (grounds for consequences of extreme prejudice).