The Foil balloons and metallic latex ballooons can be filled with helium gas and air both. Please note the happy birthday letter/ alphabets foil baluns can not float in air even if filled with helium as the 16" letters cannot float. However all the metallic and latex balloons can float up. This golden and silver baloons combination looks really pretty for any family birthdy theme celebration also kids, husband, girlfriend, boyfriend, , adults, mom dad,parents, mothers, sister or brother