Description HBL599 Digital Brushless Ultra Speed/Torque High Voltage Servo, w/Titanium Gears, by MKS     6mm Ouput Gear     One-Piece Aluminum CNC Casing     Brushless Motor     High Voltage System     Dead Band: 0.0008ms (Default)     Control System: Pulse Width Control     Working Frequence: 1520μs / 333hz     Operating Voltage: 3.5 ~ 8.4 Volts     Operating Temperature Range: -10 to 60 Degree C     Operating Speed (6V): 0.11 sec/60° degrees at no load     Operating Speed (7.4V): 0.09 sec/60° degrees at no load     Operating Speed (8.4V): 0.08 sec/60° degrees at no load     Stall Torque (6V): 416.62 oz/in (30 kg/cm)     Stall Torque (7.4V): 527.72 oz/in (38 kg/cm)     Stall Torque (8.4V): 583.27 oz/in (42 kg/cm)     Motor Type: Brushless Motor     Potentiometer Drive: Indirect Drive     Bearing Type: 12×8 mm Double bearings     Gear Type: Chrome-Titanium alloy gear     Connector Wire Length: 24.0 cm (9.4 in)     Dimensions: 40 x 20 x 38.5 mm     Weight: 73.12 g See additional images for dimensions. Note: All Standard and mini servos except the X8 range (HBL380, HBL850, HBL880) use a 6mm 25tooth spline, same as Futaba. Micro and wing servos all use a MKS 5mm spline.