World's Largest Penis Party Balloon. Mylar is safer to use than the latex balloons. Fill with Helium and instant decoration. Add a ribbon to the bag of treats! Dispense goodie bags at each table. Mylar Penis Party Balloon makes a great decoration for any adult gathering: Adult Party, Bachelor Party, Bachelorette Party, Hen Parties, even for a birthday! Actual size 27 inches by 15 inches. New image added July 31, 2013.