Ultrashape balloons are a unique way to decorate a room for birthdays, baby showers & other special occasions. Just inflate like regular foil balloons, add a ribbon & weight to use as a room decorator, centrepiece or gift. Balloon measures 38cm (15"). Suitable for inflation with helium. To inflate your balloons, you will need to purchase a helium cylinder for 30 balloons or helium cylinder for 50 balloons. Many florists also offer an inflation service for a small fee.