The reducer is the robot joint's precision bottleneck - roughly 30-50% of actuator cost, where the actuator is a third to over half the robot. We mass-produce all three types: planetary, RV, harmonic, and we are the smallest name doing it. Harmonic is the differentiator our larger neighbour doesn't lead. We integrate reducer, motor, driver into smart-actuator modules at 37.6% of revenue, sitting at both reducer and actuator layers. The barrier is real: scarce high-precision grinding, specialized metallurgy for flexsplines and cycloidal gears, long qualification cycles.