For M130 to M170 springs
The GB-05 motor series (A1 to A5) uses heat resistant enameled wire (up to 200°C)
to build the core of the motor. This helps to maintain the temperature at an efficient level, even under the full power, also it greatly increases the durability of the motor and decreases the battery consumptions.
A set of ball bearings are installed at both ends of the motor. This not only improves the rotations but also further improves the energy consumption. The front end of the motor has an aluminum cage to improve the rotations and a high durability nylon cover at the rear end to withstand the high temperature and extreme wear of the motor.
Lastly, the motor pinion gear uses high density steel that can endure the extreme rotation and pressure under high torque or high speed set up.