Two is better than one with this Tandem-X Launch Set! This duo features two extreme high-performance rockets and a powerful beast of a launch system. Designed with plastic fins the beginner rocket Amazon stands at 30 inches tall and can be built in an hour. Launching from an Estes standard model 18 mm rocket engine C6-5 this giant can reach heights over 600 ft. Crossfire ISX on the other hand is an Intermediate-level rocket that features a totally streamlined shape with aerodynamic fins and nose cone. At 15.6 inches tall and launched with Estes 18mm rocket engine C6-7 the Crossfire ISX reaches cloud busting heights of 1 150 feet. A 12-inch recovery parachute glides gently in mid-air and returns the Crossfire back to earth to launch again and again. Both bullets of this Estes Tandem-X Launch Set take off from the sturdy Porta-Pad II Launch Pad by push button command from the Electron Beam controller. Requirements for this Ready-To-Fly (RTF) set (sold separately) include: Building Tools and Construction Materials Finishing Supplies Estes A B or C engines Batteries for Launch Controller Learn the basics of crafting soaring models with Tandem-X Launch Set and blast these flying objects to amazing heights with Estes model number 1469! One of our most popular kits for beginners!