This is the HITEC/RCD (HRC) HS-50A Super Sub Micro Servo with a Universal Connector that fits Futaba J, Hitec S, JR and Airtronics Z radios. FEATURES: Compact size, resin gears, INCLUDES: One Servo with "X" horn One extra "X" horn One extra horn mount screw Two mounting screws SPECS: Length: 20.9mm (.82") Weight: 5.8g (0.20oz) Width: 11.4mm (.44") Torque: 0.6 kg-cm (8.4 oz-in) Height: 22mm (.87")(to top of case) Speed: 0.09sec/ 60° COMMENTS: For 4-cell (4.8V) use only Replacement gear set and horn set HRCM6355 case set RCDM #56354 AXY 6/13/98 ir/jl updt jxs 2/13/06