This is powerful wheelchair motor. They make great heavy-duty robot motors. 250W 75RPM motors with 17mm keyed shaft output. They are sold individually and have an electric brake mounted on the back.
A ready to ship prebuilt All-Terrain 4WD robot. It features 10" pneumatic tires and IG42 078RPM Gear motors. Controller, battery, and charger included. Also included is a cover with 80/20 1" extruded aluminum rails.