Our RCJS Rear Blade Sponsons for 2021+ SuperJets. Greatly improved handling with excellent traction when leaning over in a turn. Increases grip and stability by preventing the rear of the ski from breaking loose, enabling your SuperJet to turn like it's on rails with precision control and predictability. Will work on earlier SuperJuets, and other stand ups. You may have to drill holes to match. Comes as shown with backing plates and all necessary mounting hardware.