The Hill Descent Control (HDC) function will maintain a smooth controlled speed while descending

4-40 x 3/32" Cup Point

meaning hard hits won't force you into the "walk of shame"

Other bodies may require additional trimming beyond what is mentioned in the instructions supplied

Precision throttle and brake control

Estes Rockets - BT-60 Body Tube, for Model Rockets (3 pk) Electric Motors Helicopter The Hill Descent Control (HDC)High quality spiral wound paper tubes for kits using the BT 60 body tube. Features: Use tube couplers to connect tubes of the same diameter. Three tubes per package. Will fit nose cones NC 60. Specifications: Inside dimension: 1. 595 in (40. 5 mm) Outside dimension: 1. 64 in (42 mm) Length: 18 in (45. 7 cm)