Explore the mysteries of inertial guidance, compasses and stabilization. Runs up to 3 minutes with little wobble because it's precision machined. Dynamically balanced 6 cm steel rotor, near-frictionless Teflon stay bearings. The gimbal cradle with cone bearings pivots to hold the spinning gyroscope in place. Includes: plastic base, molded rocker with gimbal, pull cord & handle, weights, hook, instructions.