Release an inflated balloon and zoom-Newton's third law of motion in action! Nothing could be simpler for introducing Newton's laws of motion. These balloons are student favorites! The properly balanced cylindrical shape results in level flights, allowing the balloons to glide around a classroom for up to 20 seconds. Your students will love watching these balloons soar through the air with their unique squeaking “engine” sound. Set includes 50 rocket balloons and a dual-action balloon pump to inflate the balloons quickly and safely. A balloon refill package is available and sold separately.