These balloons have excess rubber that does not inflate at the top of the balloon so that it can be tied to the neck of the next balloon forming a chain. Each balloon measures approximately 30 cm long when inflated. These balloons are perfect for making elaborate balloon sculptures and decorations. Designed for air inflation only, cannot be helium inflated. For inquiries regarding balloon sculpture and decore quotes please contact our store directly on 02 95292133. Please note, you are purchasing a single uninflated balloon. The product dimensions below are for an individual balloon inflated, the shipping dimensions are for an uninflated balloon.