This APC Speed 400 pusher propeller is sized 5.5 x 4.5E, designed for pusher-configuration aircraft powered by Speed 400-class motors. The reverse pitch geometry moves air forward relative to the prop face, making it suitable for flying wings, pusher twins, and similar pusher layouts. Included is a small plastic prop adapter hardware piece for mounting. APC propellers are a widely used factory option among electric fixed-wing RC pilots. Features: 5.5 x 4.5E pusher pitch geometry Designed for Speed 400-class electric motors Includes mounting adapter hardware Pusher configuration reverse pitch 7/7/26 cs