Watch what you buy. All Trex helis are not created equal. I bought a 450x kit and the rotorhead (plastic) won't assemble right. The flybar seesaw cage is just too tight and no amount of playing with it fixes the problem. I'm seriously considering an HDX450se. Lots nicer that a 450se and lots cheaper to boot. Finless Bob on Helifreak has all of the assembly vids for free and the kit makes a killer bird. Check it out !