Du-Bro 830 Park Flyer Snow Ski The DU-BRO Park Flyer Snow Ski's are vacuum formed ABS material with two runners on each ski for excellent tracking and stearing Ski's also include a spring system to allow for flex on take offs and landings, yet remain in a positive position while in flight Best of all, the DU-BRO Park Flyer Snow Ski's mount on your aircraft in just minutes The DU-BRO Park Flyer Snow Ski's are vacuum formed ABS material with two runners on each ski for excellent tracking and steering Ski's also include a spring system to allow for flex on take offs and landings, yet remain in a positive position while in flight Best of all, the DU-BRO Park Flyer Snow Ski's mount on your aircraft in just minutes