This is an interesting item, they are two motors attached to wheels with a housing around it. I could think of lots of
projects that they would be good for, from DIY robots to ping pong ball launcher
I made an example of my idea the ping pong ball launcher.
Check out the video below and start inventing.
1x Pair of 3-6VDC motors
Pair of 3-6VDC motors Mounted in plastic housings with 2-1/2" dia. X 3/4" foam rubber wheels used to accelerate toy cars
on track. Appears to use 2 or more "C" or "D" cells. Wiring harness has 2 Battery contacts and a 3 position switch. In
one position a diode is connected in series with the motors to reduce the voltage. Motors & housings are almost
identical with the exception of one motor has a small belt drive hub.