This is the Hitec HS-965MG Coreless Ultra Speed Standard size Servo with the Universal Futaba J, Hitec S, JR and Airtronics Z Connector. Suitable for high performance aircraft to 1/4 scale, .30 size and larger helicopters and 1/10 and 1/8 scale on-and off-road vehicles. FEATURES: Dual ball bearings Coreless motor Three metal gears and one metal-Karbonite gear Water and dust resistant-not water proof Indirect drive potentiometer for long life Gold-plated contacts MOS-FET motor drive INCLUDES: One Hitec HS-965MG Metal Gear Ball Bearing Coreless Ultra Speed Servo with Universal connector, mounting hardware and instruction sheet 1.8" (45mm) diameter round servo horn 2.8" (71.5mm) double-sided servo arm 2.3" (59mm) double-sided servo arm 1.5" (39mm) single sided servo arm 1.3" (33mm) single sided servo arm REQUIRES: Installing on model, attaching linkages, and connecting to receiver. SPECS: Wire color codes: Black-Ground, Red-Power, Yellow-Signal Operating speed: 0.13 sec @ 60° at 4.8V Torque: 102.76 oz-in (7.4 kg-cm) Weight: 2.18oz (62g) Length: 1.6" (40mm) Width: 0.78" (20mm) Height: 1.45" (37mm) Wire length: 12" (305mm) approximate COMMENTS: A note on Coreless motors: conventional servo motors have a steel core armature wrapped with wire that spins inside the magnets. In a Coreless design, the armature uses a thin wire mesh that forms a cup that spins around the outside of the magnet eliminating the heavy steel core. This design results in smoother operation and faster response time. jxs 7/13/06 ir/jxs