The Nano Pro is designed for applications where a high performance small powerful lightweight servo is required 400 450 electric helicopters 118 model cars and park fly model planes. The Nano Pro has superb positional accuracy and minimal lost motion slop. Specification Torque 16 20 Ncm 4.86.0 V Transit speed 0.09 0.07 Sec.40 4.86.0 V Dim. LxWxH 23.5x12x26 mm Weight approx. 11g Gearbox Karbonite