Two is better than one! This exceptional rocket set features a pair of extreme, high performance rockets and a launch system. The E2X Amazon is as imposing as the name sounds. This giant stands almost 30 inches tall and is quick and easy to build! A black body tube, precolored plastic nose cone and fins and a tiger striped 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 feet. 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 inches tall. When launched with powerful Estes standard engines, this bullet can reach cloud busting heights up 1, 150 feet. A preassembled 12 inch parachute returns the Crossfire back to earth to launch again and again. LAUNCH SYSTEM includes Electron Beam Launch Controller (requires 4 1.5V high quality AA alkaline batteries) and Porta-Pad II Launch Pad. ADDITIONAL INFORMATION Length Amazon : 29.4 in. (74.7 cm) Crossfire ISX : 15.6 in. (39.6 cm) Diameter Amazon : 1.33 in. (34 mm) Crossfire ISX : .98 in. (25 mm) Estimated Weight Amazon : 3 oz. (85 g) Crossfire ISX : 1.3 oz. (37 g) Construction Amazon : Plastic Fins, Self-stick Decals, 18 in. (46 cm) Parachute Recovery Crossfire ISX : Laser cut Wood Fins, Self-stick Decals, 12 in. (30.5 cm) Parachute Recovery Recommended Engines Amazon : B4-2(First Flight), B4-4, B6-2, B6-4, C6-3, C6-5 Crossfire ISX : A8-3 (First Flight), B4-4, B6-4, C6-5, C6-7 Projected Max Altitude Amazon : 600 feet (183 m) Crossfire ISX : 1150 ft. (350 m) Age Recommendation Estes model rocketry is recommended for ages 10 and up with adult supervision for those under 12. Unless otherwise specified, all models require assembly. Tools, construction and finishing supplies sold separately. In order to launch, a launch system, model rocket engines, starters and recovery wadding are required sold separately-unless otherwise specified.