Hard to review this thing. It does exactly what you'd imagine. You open your beer, fire the debris at someone and then run away. The worst thing about this is that people always want to have a go. And you have to let them. It's made of hard plastic and has a small metal lip inside it, held by 4 little screws. It's well made. We threw it at the wall and it didn't break. The only thing we'd change is the colour choices. Obviously this is completely pointless, but that's the beauty. It'd be an amazing attachment to any set of keys. Disclaimer: don't fire it at people's faces. They don't like it. Try getting it in their drinks or something.