Rainbow Hot Air Balloons are made with quality weather resistant polyester. The Balloon measures 26 inch x 17 inch with 12 colorful panels supported with fiberglass rods which help maintain their shape. Plastic backs the fabric, making the panels rigid. Heavy duty swivels attach the 42 inch spinner twister tail with streamers and is used to hang your Balloon. Balloons ship flat and they are easy to assemble.