I had to order threaded CO2 cartridges cause no store locally carried them. Once trying out the gimmick it got so cold I had to drop the gimmick becasue it started to freeze my fingers. There was ice in the balloon. It did not inflate a 12" balloon. The DVD does a poor job explaining the directions with sub titles. I had big ideas for this gimmick and it let me down.The gimmick is large and takes some cover to hide it from view. I'm going to try to warm the cartridge in warm water next time and see if that improves the inflation and decreases the ice. I'd save your money on this one.