8pcs TT Motor DC Electric Motor 3V-6V Dual Shaft Geared Motor Magnetic Gearbox Engine Motor for Arduino Smart Car Robot

I got the Aediko set with wires instead. As these are the same motors, I can say that it was easy to install and use. These are plastic motors. These run smooth for a long time.

I 3-D printed a 6 wheel Mars rover with the articulated suspension and used 6 of these one for each drivewheel. They work great but they are not real strong but good enough for small robotic projects.

None would start up at 5V without forcing it. Took one apart and found the "grease" they used is a clear sticky gel. Luckily I only needed two motors so I took them apart, cleaned the gears with mineral spirits, and regreased with silicone/teflon grease. Worked great after that but they run about 3rps at 5V, that's about 180rpm. Nowhere near the 10 RPM stated in the title. However, if you look carefully at the specs down the page it does say 90RPM at 3V and 200RPM at 6V. They need to fix their description.

The description states the motor is 10 RPM. Tested upon arrival. It was spinning at least 200 RPM. Not accurate. Had to return. The quality seemed good for the price.