This is the Futaba S3154 Digital High Torque, High Speed Micro Servo. Ideal for electric planes and small electric helis! FEATURES: Increased precision as it is Digital Light weight, perfect for Micro helis Nylon gears One year warranty YOU WILL RECEIVE: One S3154 Digital Micro Servo One .91" x .64" (23mm x 16mm) 4 arm servo horn (comes pre-installed) One 1.33" x 1.33" (34mm x 34mm) 4 arm servo horn REQUIREMENTS: Installing into your model Order DUBM6924 if mounting hardware is needed SPECIFICATIONS: Torque: 21 oz-in (1.5kg/cm) @ 4.8V 24 oz-in (1.7kg/cm) @ 6V Speed: 0.10 sec/60° @ 4.8V .09 sec/60° @ 6V DIMENSIONS: .09 x 0.4 x 0.8in (22 x 11 x 20mm) Weight: 0.28oz (7.9g)