Calling all mad scientists! Celebrate his birthday with these wacky 17" Mad Scientist Balloons by LOONBALOON! This 2-pack of foil mylar balloons features a wacky "Mad Scientist Happy Birthday" message, perfect for the science enthusiast in your life. They're ideal for adding a fun and geeky touch to any birthday celebration. Made from high-quality foil with a self-sealing valve, they can be inflated with helium to create a delightful floating display or with air for hanging (balloons arrive uninflated). Pair them with our other birthday latex balloons for a truly monstrously fun bouquet!