Two is better than one. You’ll get X-tra value with the Estes Tandem-X Model Rocket Launch Set. This exceptional rocket set features a pair of extreme, high performance rockets with a launch system for launching them. Whether you’re a new rocketeer or a seasoned veteran, launch in tandem for an exciting model rocket experience. The E2X (Easy to Assemble) Amazon is as imposing as the name sounds. This giant towers almost 3 ' (91 cm) high and is quick and easy to build. A tiger-striped body tube, precolored plastic nose cone and fins and self-stick decals make building this rocket easy to do in about an hour. When flown on our standard engines, this huge rocket can reach heights over 650 ' (198 m) with recovery on a colorful 18 " (46 cm) preassembled parachute. The Crossfire ISX is a Skill Level 1 kit that can easily be built in about a day. This rocket features a totally streamlined shape with aerodynamic fins and nose cone. It stands 15.6 " (39.6 cm) tall. When launched with powerful Estes standard engines, this bullet can reach cloud busting heights up to 1,200 ' (366 m). A preassembled 12 " (30 cm) parachute returns the Crossfire back to earth to launch again and again. Glue, modeling tools and Estes engines required - sold separately. The Electron Beam Launch Controller uses 4 AA 1.5V batteries - sold separately. Recommended for ages 10 and up with adult supervision for those under 12.