Futaba S3154 Digital Micro HT Servo FEATURES: Increased precision as it is Digital Light weight, perfect for Micro helis Nylon gears One year warranty INCLUDES: 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 (pre-installed) REQUIRES: Installing into your model Order DUBM6924 if mounting hardware is needed