This is the Futaba BLS253 Brushless Heli 3D Servo.
FEATURES: Designed for 3D helis
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)