Futaba S9551 Low Profile Digital Hi Speed/Torque Servo FEATURES: Digitally enhanced microprocessor cuts about half of the response time from transmitter input to servo reaction INCLUDES: One S9551 Digital Low Profile Servo with 0.83 (21mm) diameter round horn, 1.7 (44mm) long T-shaped horn, four eyelets, two rubber grommets INCLUDES: One S9551 Digital Low Profile Servo with 0.83 (21mm) diameter round horn, 1.7 (44mm) long T-shaped horn, four eyelets, two rubber grommets