: Cut out four black circles and glue them to the sides.
: Use a Magnet-Powered Car technique by attaching a straw to the bottom, sliding a toothpick through it, and securing bottle caps to the ends. Cars - Motori ruggenti
For a more detailed visual guide, you can watch tutorials like Make Lightning McQueen from Paper or Paper Lightning McQueen DIY with Spinning Wheels . : Cut out four black circles and glue them to the sides