1pcs Cheer Cup balon + 1pc Champagne balon Size before inflate Champagne balloons 50cm*100cm, Cheer cup balloons 45cm*108cm Our size is flat size before inflate, after inflate, the size will little small than that. The balloons have self sealing valves. Once inflated the balloon will stay up for over a week. The balloons can be filled with helium to float or filled with air to attach to any surface. The balloon will come flat and need inflating after you receive it.The balloon sold without Helium.