A foil balloon in the shape of a soccer ball is an attractive decoration not only for a birthday party.Are you going to throw a football childrens party? Or go watch football together in the pub or at home. Foil balloons can stay inflated for up to 5 days, which is great for longer events. They are available in a wide variety of shapes, including hearts, giant letters, numbers and stars. Balloons have a mirror-like quality that makes them popular with photographers and artists. 50 cm (20), size after inflation approx. 40 cm (16). Inflate with helium.