Motor & Foam Wheel
The Motor & Foam Wheel module spins quickly when you apply a voltage between 8 and 12V. By flipping the circuit module 180 degrees, you can get the motor spinning in either direction. The soft foam wheel helps you see the motor shaft rotating, but you can also create your own propellers or paper crafts to put on top!
(Note that the Coin Cell Battery Adapter doesn't have enough juice to power this module. Use the 9V Battery Adapter or the USB Adapter instead.)