Engino Mechanical Science Kit - Forces, Energy, Motion Construction Kit Builds 5 models, a dragster powered by an elastic spring, a crash test car, a catapult, a gravity operated fan and a balloon-powered flying plane Multidimensional construction system, Build structures and machines with 114 parts 36 page activity book is included with the fun, easy to assemble models - more plans can be downloaded from Engino's website Excellent addition to a home-school curriculum Another fun, educational product from Elenco, the company that brings you Snap Circuits