Specification:

BLS0550T

Torque and Speed: 

11.3kg/cm   0.028sec/60° @8.2V
10.7kg/cm   0.035sec/60° @7.4V

9.4kg/cm   0.045sec/60° @6.0V

4.8kg/cm   0.056sec/60° @4.8V

Dimension: L40xW20xH37mm

Weight: 67g

Frequency: 760µs/333hz

Gear Type: Metal Gear

Operation Voltage: 4.8V-8.4V

Motor Type: Brushless Motor

BLS0550HV

Torque and Speed: 

50kg/cm   0.052sec/60° @8.2V
45kg/cm   0.065sec/60° @7.4V

33kg/cm   0.076sec/60° @6.0V

27kg/cm   0.12sec/60° @4.8V

Dimension: L40xW20xH41mm

Weight: 72g

Frequency: 1520us/333hz

Gear Type: Metal Gear

Operation Voltage: 4.8V-8.4V

Motor Type: Brushless Motor