Lego City Cubez Balloon 15 . The size is approximately 15 inch x 15 inch ( 38 inch x 38 inch ). Balloon weight and balloon string are not included. Just need helium to inflate the balloon. Balloon will arrive uninflated. There is 1 balloon in a pack.WARNING: CHOKING HAZARD - Children under 9 years old can choke or suffocate on uninflated or broken balloons. Adult supervision is required. Keep uninflated balloons from children. Discard broken balloons at once.