Fill with water and pump in air. Newton's Third Law does the rest!
For every action there is an equal and opposite reaction.
Water and air go down, forcing the rocket upward. The rocket flies high.
From about age 10 with adult supervision. Please instruct children to point the rocket upward, away from people (including them), and windows.
Small parts present a potential choking hazard to children under 4 years of age.
Colors and styles may vary from the photograph.
Gift wrap orders: input salutation in the comment section at the end of the ordering process.