ALIGN HEG78003 GP780 Head Lock Gyro Combo (GP780 + DS520) Made using high end components and materials Years of knowledge in the flying RC industry Great for fun or commercial use This product is made from high quality materials and it is designed for lasting performance Use Align tools, replacement parts and accessories to get the most out of you Align Helicopters! This is for use on Align products such as the T-rex 500 series helicopters, consult your user's manual for exact parts listings