This is the Tandem-X Flying Model Rocket Launch Set by Estes. New $21.89 (33% off). Suitable for Ages 10 & Older w/Adult Supervision. Amazon is an E2X Skill Level Rocket Crossfire ISX is a Skill Level 1 Rocket. Features: * Two easy to assemble model rockets built with a cardboard body tubes and plastic cones. * Amazon has colored parts including plastic fins. * Crossfire ISX has laser cut balsa fins. * Depending on the engine of choice, the Amazon can fly up to 600 feet high and Crossfire an amazing 1150 feet high. * Pre-assembled plastic parachutes. * Illustrated assembly guide and detailed launching instructions.