To demonstrate and teach the principle of a Gyroscope. All metal construction except for plastic bases. Consists of 2 plastic bases, 4” diameter, one flat and other with a rocker, to experiment on, as to what happens when the base is moving. The Gyroscope is mounted in a metal ring 3-½” dia, Gyroscope wheel 2-¼” dia. Comes complete with spinning cord. Total height 7.5”.