This is the Futaba S3051 HV High Voltage High Torque Standard Servo.     
                                                                               
FEATURES: Digitally enhanced microprocessors cut in half the response time     
            from transmitter input to servo reaction                           
          Standard size servo offers high torque and high speed                
          One year limited warranty through Hobby Services beginning at date of
            purchase                                                           
                                                                               
INCLUDES: Futaba S3051 HV High Voltage High Torque Standard Servo with 0.83"   
            (21mm) Round Horn, 1.4" (35.2mm) Round Horn 1.5" (38.5mm) 4-Point  
            Horn, 1.2" (31.9mm) 6-Point Horn, Mounting Hardware and            
            Instructions                                                       
                                                                               
REQUIRES: Installing in model, attaching linkage and plugging into receiver    
                                                                               
SPECS:    Speed: 0.21 sec/60 @ 6.0V                                           
                 0.19 sec/60 @ 6.6V                                           
                 0.17 sec/60 @ 7.4V                                           
          Torque: 132.0 oz/in (9.5 kg/cm) @ 6.0V                               
                  138.9 oz/in (10.0 kg/cm) @ 6.6V                              
                  145.8 oz/in (10.5 kg/cm) @ 7.4V                              
          Size: 1.57 x 0.79 x 1.50" (40 x 20 x 38.1mm)                         
          Weight: 1.73 oz (49 g)                                               
          Power Supply: 6.0 - 7.4V DC                                          
          Hron Screw Size: 3x8mm