SG503

Gear ratio : 1:15 Weight : 36.4g/pcs

SG301

Gear ratio : 1:18 Weight : 36.2g/pcs

SG360

Gear ratio : 1:14 Weight : 35.8g/pcs

SG381

Gear ratio : 1:16 Weight : 36.0g/pcs

SGM

Gear ratio : 1:16 Weight : 36.8g/pcs