This is the Tandem-X Flying Model Rocket Launch Set by Estes®. Suitable for Ages 10 & Older w/Adult Supervision. FEATURES: Two easy to assemble model rockets built with a cardboard body tubes and plastic cones. The Amazon has colored parts including plastic fins. The Crossfire ISX has laser cut balsa fins. Depending on the engine of choice, the Amazon can fly up to 650 feet high and Crossfire an amazing 1200 feet high! Pre-assembled plastic parachutes. Illustrated assembly guide and detailed launching instructions. The Estes® Rocketeer's Guide. Cardboard packaging with a handle for convenient carrying and storage of your rockets and supplies. INCLUDES: (2) Model Rockets (2) Parachutes (1) Launch Pad Safety Cap w/Streamer (1) Launch Controller REQUIRES: Assembly Engines: Crossfire ISX - Amazon - 1/2A6-2 B4-2 (ESTT1601) A8-3 (ESTT1598) B4-4 (ESTT1602) B4-2 (ESTT1601) B6-2 (ESTT1605) B4-4 (ESTT1602) B6-4 (ESTT1606) B6-2 (ESTT1605) C6-3 (ESTT1613) B6-4 (ESTT1606) C6-5 (ESTT1614) B6-6 (ESTT1607) C6-3 (ESTT1613) C6-5 (ESTT1614) Recovery Wadding (ESTT2274) Carpenter's Glue (GPMR6161) 4 AA Batteries (SANP3501) SPECS: CROSSFIRE ISX - AMAZON - Length: 15.6"" (39.6cm) Length: 33.6"" (85.3cm) Diameter: 0.976"" (24.8mm) Diameter: 1.35"" (34.3mm) Weight: 1.4oz (39g) Weight: 3.4oz (96g) Recovery: 12"" Parachute Recovery: 18"" Parachute Max Altitude: 1200ft (366m) Max Altitude: 650ft (198m)