Water Rockets are the perfect low-cost flying rocket without the hassles of traditional solid propellant rockets! There's no fire danger (the rocket fuel is water). There's no-cost per launch - You can fly them over and over. YOU control the flight performance by varying amount of fuel and pressure. Flies to over 200 feet! You supply a PET soda bottle - 24 oz, 1 liter, or 2 liter Included in this Starter Set are supplies to build your first water rocket (except you supply the PET bottle),and a Complete Launch System. You get: 1 pre-cut Rigid Foam Fin Set 1 translucent molded nozzle 1 Foam Recovery bumper Color assembly and use instructions 1 Fuel measuring flask Includes complete Launch System. You'll also need a standard bicycle pump with a pressure gauge. 99-7308