Wow! Do it again! That’s what you’ll hear in your classroom when students see this amazing demonstration. Simply give the disk a gentle spin and watch as it spins around and around! As the disk spins faster and its angle changes, students are captivated by the different sounds and fascinating visual displays. Many concepts can be discussed with this unique product such as angular momentum, forces and vectors, friction, and conservation of energy. Includes a mirror, steel disk, three holographic films, and several holographic wedges. Mirror diameter is 9" and the steel disk is 3".