every child wants to be an astronaut. and with smartivity\'s blast off space rocket s.t.e.m. educational d.i.y. toy kit, your child (6+ years) can bring their imagination to life. this kit is based on the principles of elasticity, gravity, thrust and propulsion. the kit contains all the elements that a child can assemble a rocket and rocket-launcher and launch their own missions.the rocket launcher plate has a locking mechanism designed to make the game even more fun. once assembled, children can experiment with their rockets by varying the weight of the rocket and elasticity of the launch plate to understand the fundamentals scientific concepts.