Description HV1220 Digital High-Torque High Voltage Servo, with Titanium Gears, by MKS     Dead Band: 0.0008ms (Default)     Control System: Pulse Width Control     Working Frequence: 1520μs / 333hz     (RX) Required Pulse: 3.0~8.4 Volt Peak to Peak Square Wave     Operating Voltage: 4.8~8.4 V DC Volts     Operating Temperature Range: -10 to 60 Degree C     Operating Speed (7.4V): 0.129 sec/60° degrees at no load     Operating Speed (8.4V): 0.115 sec/60° dagrees at no load     Stall Torque (7.4V): 22.1 kg-cm (307 oz/in)     Stall Torque (8.4V): 23 kg-cm (319 oz/in)     Motor Type: Coreless Motor     Potentiometer Drive: Direct Drive     Driver Type: FET     Bearing Type: Dual Ball Bearings     Gear Type: Titanium Gears     Programmable: NO     Connector Wire Length: 15.0 cm (5.9 in)     Dimensions: 40X20X37 mm     Weight: 57.70 g ( 2.03oz) See additional photos 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.