ESKY Big Lama is a very good helicopter for beginner becasue it is coaxial design, large in size and having a high performance power system. However, the original center shaft may cause Blade Strike (Upper rotor and Lower rotor jammed together, becuase of flexy blades), and slow respond because of the close distance of the 2 rotors. There for, AiRY developed a Turbo Shaft for the ESKY Big Lama, it extends the distance between the Upper Rotor and Lower Rotor by 27mm, eliminating the "Blade Strike" situation and dramatically increase the respond of the movements. Also, this kit will include a high percision Alumnium Center Hub, Upper and Lower Blade Holder and Swahsplate, they all increase the durability and percision of your helicopter. You will not regret for getting this best upgrade for AiRY Turbo Kit for Big Lama.