10 Polka Dot Helium Balloons Bunch of 12" is a special way to surprise someone with helium balloons.They are commonly used for decorating events such as birthdays, weddings, anniversary, valentine's day, baby shower and other special occasions.For parties, it's common to use a combination of different balloon sizes and types, such as latex balloons, foil balloons in various shapes and sizes, and sometimes even giant balloons.