This is the Futaba BLS253 Brushless Heli 3D Servo. FEATURES: Designed for 3D helis Standard size Equipped with metal gears and two ball bearings 30% faster response than standard digital servos and five times longer lasting than servos with brushed motors Same power consumption as brushed digital servos One year limited warranty INCLUDES: Futaba BLS253 Brushless Heli Servo with universal connector 0.83" (21mm) diameter round horn, 1.8" (45mm) diameter round horn 1.2" (32mm) diameter 6-point horn, 1.5" (38.8mm) diameter 4-point horn mounting screws, eyelets and grommets REQUIRES: Installing in heli, connecting linkage and connecting to receiver SPECS: Torque: 117 oz-in (8.4kg/cm) @ 4.8V 147 oz-in (10.6 kg/cm) @ 6.0V Speed: 0.13 sec/60° @ 4.8V 0.10 sec/60° @ 6.0V Size: 1.6 x 0.8 x 1.5" (40 x 20 x 37mm) Weight: 2.0 oz (58g) jxs 7/24/08 ir/jxs