This is one complete eye mech that will work with any of my animatronic eyes. The eye mech is intended to be used with 4 HXT900 servos and .055 "Music Wire" for pushrods. The eye mech comes pre assembled, so that all is needed is to attach the servos and hardware. All moving parts have .6mm clearance. The various available eyes slide perfectly over the gimble mechanism and are secured in place with loctite 425. The eye lids are intended to be set backward at a 45degree angle and the optional eye lid attached. Eye movement should be greater than 18 degrees in any direction. (Update Version 1.5) This version has a smooth bevel on the gimble mech to help reinforce the pivot points, and the upper and lower eyelid assembly have been thickened up to add strength. http://www.hobbyking.com/hobbyking/store/__662__HXT900_9g_1_6kg_12sec_Micro_Servo.html