The BMS-101DMG Digital miniature servos are designed for the smallest and lightest models.
The 7.4mm-wide servos weigh just 4.4 grams.
The supply voltage can be in the range of 3.8-6 volts. The servo can easily be powered by a 1S LiPo battery.
The servo housings are plastic, and the gears are metal.
Technical data:
*Follow the instruction manual included with the product.