No more seasonal flying! 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. Ideal for up to .60 powered aircraft. Featuring a spring loaded design, Snowbird Skis flex on take-offs and landings yet remain in a positive lock position while in the air.