1. A small box or carton, for example a milk or fruit juice carton. It should be approximately 5cm x 5cm x 12cm in size.
2. Two small drinking straws (each about 6cm long). Alternatively you could cut a longer straw in half.
3. One longer drinking straw (about 10cm long).
4. Two wooden dowels or rods (8cm long, and 5mm in diameter). Dowel is a special type of wood that is round, like a pencil. You can buy dowel cheaply from any 'Do-it-yourself' store.
5. Four plastic bottle tops, a balloon, two elastic bands, some sticky tape, a hammer and a small nail.