I have no idea what they are called. I am usually well into my cocktail sesh by the time we buy them, but they are a short 8" tube(or so) with some stuff you drop in and light. It mortars up in the air and blows up and basically looks like small time driveway version of the bigger ones you see at shows. Buy a bunch, twist like four together at a time and enjoy.
Also, I fill a 5gal bucket up with water and get the biggest waterproof things I can get and spray water everywhere until the kids get bored or the bucket breaks.
Pretty great time.