We continue to develop and grow the Pro Series II line! This time around we're offering up a BT60 (1.64 in/42 mm) diameter body tube for your building enjoyment. Standing over 45 inches tall, the Star Orbiter comes with the quick release motor retention system just as the other Pro Series kits do. (9750 Pro Series II 29MM Retainer Set ' is also sold separately). Construction of this kit is not difficult and the altitudes you will reach are very impressive! Building and finish work can easily be accomplished over a few days.