When two stages are not enough, try three! A D first stage booster gets things going in a hurry. This high flying rocket roars to ultra high altitudes - over a half mile high! 41 in. long, .98 in. diameter, Booster recovery - tumble, Main stage recovery - two streamers, Die cut balsa fins, Max. Altitude 2660 ft., Recommended Engines- Single stage flight - A8-3, B4-4, B6-4, C6-5, Three stage flights- Booster C11-0, D12-0, Second stage- B6-0, C6-0, Third Stage- B6-6, C6-7, Requires a 3/16 Maxi launch rod - EST-2244 - sold separately.