Our Number 21 Balloons are delivered helium filled in a large red and white candy stripe box. They will make a fun birthday gift and will double up as a colourful party decoration. Order your birthday balloons online for fast UK delivery. Foil Number Balloons, Balloons Online, Helium Balloons, Gifts For 18th Birthday, Best Birthday Gifts, 21st Birthday, 60th Birthday Balloons, Diy Party Decorations, 50th