This is a bundle of items that allows you to build a four-wheeled robot chassis as seen in the picture. It does not come assembled and does not include any control electronics.
4-wheeled Robot Chassis Kit Contents One ROBOT-CHASSIS-4 clear plexiglass base. This has plenty of slots and holes for mounting your control circuit, sensors, servos, etc., and routing your wiring.
Four MG-6-48 gear motors. These operate at 6V and provide a 1:48 gear ratio. If you need more torque, you can replace these with MG-6-120 (not included).
Four MG-ACC gear motor assembly kits (screws, nuts, and mounting plate) that attach to the wheels.
Four MG-WHEELs. Each is 65 mm in diameter and 25 mm wide. They mount to the gear motors.
One BAT-HOLDER-4XAA (not pictured) which you can use for motor power via four AA batteries (not included). The battery holder has a supply wire and a ground wire (bare ends), and it comes with screws and nuts so you can affix it to the chassis.