Preparation materials and tools: balloon, straw, straw about 10cm, screwdriver for cross screwdriver, rubber band, screwdriver, tire rack.

1. Materials for assembling wheelbarrows. You can take out the needed materials from some discarded toys and get ready.

2. Assemble the body first. It can also be taken out of waste toys, as long as there is a roller. Fix the wheel carrier at both ends and stick it with glue.

3. Cut a straw and keep the head of the balloon.

4. Put the balloon on the straw and fix it with a rubber band. The rubber band can be used for about 3-4 times to ensure no air leakage.

5. Fix the suction pipe on the car body with a cable tie. The cable tie will fix the straw. Don't compress the straw with too much force. Glue can be slightly applied to the suction pipe and the underbody.

6. Blow up the balloon, then hold the straw at the other end, put the car on a smooth surface, loosen the straw and watch it run. A balloon and a straw? Hand-made balloon car, and that's it.