One of the best modifications for your PA-12! The VG's lower stall speed, increases aileron control and more. Tail strakes virtually eliminate spins. Check out our website for a video showing aircraft flying with our Vortex Generators. You'll want this kit for your aircraft! (http://www.cubcrafters.com/video). Includes STC, Flight Manual Supplement, template, installation instructions, drawings, Vortex generators, hardware, tail stakes....everything you need to install this great kit!