This kit provides better performance for your RC helicopter. Includes: 2217 KV1250 motor, 8060 propeller, steering motor, and 40A XT60 ESC. SG90 9g Servo Parameters: Size: Approx. 21.5 x 11.8 x 22.7mm Weight: Approx. 9g No-load Speed: 0.12 s/60 degrees (4.8V) Stall Torque: 1.5-1.7 kg/cm (4.8V-6V) Operating Temperature: -30-+60℃ Dead Zone Setting: 5 microseconds Operating Voltage: 4.8V-6V 2217 Motor Specifications: Size: Approx. 27.8 x 32mm Shaft Diameter: Approx. 4mm Kv: 1250kv 40A ESC Specifications: Connector: XT60 Continuous Current: 40A Peak Current: 55A (10S) Power Supply: 2-4 lithium batteries (not included) BEC Output: 5V at 3A (Linear Regulator Mode) Maximum Speed: 210,000 rpm for 2-pole motor, 70,000 rpm for 6-pole motor, 35,000 rpm for 12-pole motor Application: Suitable for RC remote control helicopters Features: Micro servo SG90 9G weighs only 9g and has a torsion of 1.5-1.7 kg/cm (4.8V-6V). 40A ESC with safety arming function, throttle calibration function, and support for multiple programming methods. Compatible with lithium batteries (not included). The timing can be changed to suit different brushless motors. Comprehensive protection, including low-voltage protection, overheating protection, and throttle signal loss protection.