3 years & up. This kit is full of fun and STEM learning! Build your own domino stack, chain reaction or run. The dominoes are built to pro-scale so they are balanced for perfect building and toppling. The rapid tracks, spinners and templates help you design anything you can imagine such as stunts, tricks or cool designs. The possibilities are endless! Kit includes 180 kinetic dominoes, 5 rapid tracks, 1 staircase bridge, 1 speed template, 2 straight tracks, 12 domino arcs and 3 spinners. Non-toxic materials.