This is the chain and sprocket kit for the IG52-DB4 robot platform. It includes the sprockets, 6 feet of #25 chain, and 4 connecting links.
The MGS1600GY is a sensor capable of detecting and reporting the position of a magnetic field (typically magnetic tape on the floor) along its horizontal axis. Includes a built in Gyro. Replaces MGS1600 TS-072-000