Du-Bro 825 Black Snowbird Skis, Main Du-Bro Snowbird Skis make it possible to fly all year Easily mounts on airplanes with dural or wire landing gear in about 5 minutes Snowbird Skis are manufactured out of high density polyethelene; Runners are molded right on the ski for better tracking Featuring a spring loaded design, our Snowbird Skis flex on take-offs and landings yet remain in a positive lock position while in the air All mounting hardware included Du-Bro Snowbird Skis make it possible to fly all year Easily mounts on airplanes with dural or wire landing gear in about 5 minutes Snowbird Skis are manufactured out of high density polyethylene; Runners are molded right on the ski for better tracking Featuring a spring loaded design, our Snowbird Skis flex on take-offs and landings yet remain in a positive lock position while in the air All mounting hardware included