Way to Celebrate! 42-inch Number "0" Gold Foil Balloon. Each Pack contains 1pc of gold color number foil balloon which is made of Aluminum Foil. This foil balloon can be inflated with helium or air(air can’t float). This Number "0" Foil Balloon is perfect for party decoration, for child's birthday or an anniversary, wedding, bridal shower, baby, graduation, and birthday party decorations. Using the air pump to inflate is always recommended.