A typical chinese yellow plastic gear motor, with a wheel.
Please note that it comes with one wheel only (said in Sean Connery accent for maximum effect).
Buy two sets to put one on each side of your thing and then you can use “skid steer” type steering.
These are extremely common lots of projects use them, cheap as chips and get the job done for your little inventions.
Voltage is 3 to 6v, current is 150 to 200mA, the gearing ratio is 1:48
The wheel’s outside diameter is 67mm and it is 27mm wide give or take.
The axle on both sides of the motor turn the same direction if you were wondering.
All of our products are shipped from Christchurch, New Zealand using CourierPost for NZ, and Airmail for international.