Provides enough dominoes and accessories for 20 students individually with dominoes or as pairs working with an even amount of the chain reaction items. Great for STEM and STEAM. Set includes: 1,200 Mixed Kinetic Dominoes, 10 Rapid Tracks, 10 Bridges, 10 Straight Tracks (5"), 10 Domino Spinners, 10 Domino Templates, 16 Line Reactors, 24 Arcs, and 5 splitters (4 ways).