Features: The birds should install three bands! Hand shake thirty-five to forty circle.2 or 3 rubber bands make it work great. If you want it fly well, you should do shakedown test. This kit contains everything you need to make a rubber band powered ornithopter. When its ready to fly, just wind up the handle and take off it! You can adjust the climbing angle and turning radius to give you more control over the flight as well. Note: Random combination delivery Contains: two flying bird toys