Note: Piston Pump required for filling Yo-Yo balloons (M128, sold separately). Fill the balloons with part water and part air to create a balloon yo-yo that kids love. Package comes with 100 assorted heavy weight 5" balloons, clips, straight rubber band strings, and instructions. You will need the M128 Pump to inflate your balloons with water. Balloons can be tied by hand, but the M147 Balloon Clip Fixture makes it quick simple and easy to seal. Whether you use these balloons as prizes or sell them for profit at your novelty stand, they will be a hit.