Add the realism of functioning retracts to your 10- to 15-sized airplanes. E-flite's completely self-contained retract systems require no air tanks, complex linkages, or even extra servos. They simply need to be bolted into place and plugged into the receiver. A specially designed Y-harness is also included, allowing pilots to use a single receiver channel to control all retract units. Specifically designed for the Parkzone Fw-190A-8, the retracts feature aluminum trunnions and 4mm struts to handle the loads of the long Fw-190 landing gear legs.