This selection of premium servos weighs from just 18 to 30 grams. They are well proven in medium size electric and IC aeroplanes, and also 450 - 500 class helicopters. Standard (NES) and Digital (DS) versions are available, as are a wider choice of either plastic or metal gear-sets. JR midi servos are widely used in model gliders, where the low weight and small size allows them to be used in compact installations.