Uses an empty 1 or 1.5 litre plastic lemonade or cola bottle. The kit contains a special cap, nozzle and fins that can be attached to the bottle. An air tube is connected to the adaptor which in turn is connected to a cycle pump. The bottle is part filled with water and air pumped into the bottle. The pump connector on the bottle releases at a set pressure and the rocket then launches. The rocket will reach a height of approximately 20m. The bottle and cycle pump are not supplied, all spares available. Complete with full instructions.