Chainex Rocket Stunt Kinetic Energy Experiments

This really wasn't very good. The peices appear cheaply made and don't fit together properly, which means it doesn't work either at all or very well. The key launching mechanism doesn't stay locked so you have to hold it manually. My son lost interest in approx 1 minute, after the first 3 tries failed. Save your money and invest in a better quality chain reaction kit.. or even Hot Wheels, which is better quality that this.