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Includes 6 Tube Couplers in 2 different sizes. BT55 and BT60. Perfect for connecting 2 body tubes of the same size together! 6 Tube Couplers 2 each. BT55. 1.25 inches long. 2 each. BT60. 1.5 inches long. 2 each. BT60. 3 inches long. Estes model rocketry is recommended for ages 10 and up with adult supervision for those under 12. Unless otherwise specified, all models require assembly. Tools, construction and finishing supplies sold separately. In order to launch, a launch system, model rocket engines, starters and recovery wadding are required - sold separately-unless otherwise specified.