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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. Package Contains 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.