Instruction: ● Suitable for T-REX 550/600 ● The brand new 550E three tail blade set is specially made from aerospace grade aluminum alloy with precise mechanical process, highly enhance structural rigidity and precision. ● Total 3 tail blades design allow to achieve superior tail-lock performance and excellent controlling feel. For those who is addicted to 3D flying, you must convert to the three tail blade set and enjoy the amazing powerful flight performance.