One Balloon Air Helicopter. This set comes with one 10.75 inch helicopter propeller and four 5 inch latex balloons. Just blow up your balloon put the propeller around the neck of the balloon and watch the balloon helicopter fly in the air with a funny squeak. This Balloon Air Helicopter is easy to assemble and fun for everyone. This will make a fantastic party favor and fun party activity. So, be sure to get one for each guest at the party.