The 450-size rc helicopter barebone kits sold on XHeli.com are manufactured with the latest CNC machinery and made by only the highest grade hardware to ensure our customers the most superior piece of art. While most parts on these helicopters are compatible with some of the world's most popular 450-size electric helicopter such as the T-Rex 450, these kits are also refined over and over again to eliminate all the weak points to guarantee hobbyists the best performance out there.