Quiet More Quiet than current VRSF series, which uses helical gears. High stiffness cross-roller bearing at output. Compact and strong body produces high power. Precision backlash series 0.05°(3 arc-min) or below. Flange output by large diameter cross-roller bearing. Compact design contributes to apprication flexibility. Long life No grease change required due to high-grade grease packed in sealed body. No maintainance required for a long period (about 20,000 hours) due to high-durability and less wear. Easy installation Easy installation to any servo motors.