MG996R Metal Gear Torque Digital Servo with Arm Horn, SENHAI 4 Pack Robot Servo for FUTABA Hitec Sanwa GWS JR RC Helicopter Car Boat Robot COMPATIBILITY: Compatible with most standard receiver connector: Futaba, Hitec, Sanwa, GWS, etc. GOOD QUALITY: These metal gear torque servo are stable and shock proof and also of high speed. GOOD DESIGN: With metal gear and double ball bearing. FOR DIFFERENT MODELS: Good for truck, Boat, Racing Car, Helicopter and Airplane. BONUS: Come with 4 Metal Servos Mount and 16 Screws.