This is a pair of wing support plates for the Proline Trifecta wing. Made from 1.5mm glossy carbon fiber, these supports help prevent cracking around the mounting holes and offer fore/aft adjustment by adding extra holes to the wing itself. Picture shows four holes, production model has three sets of holes. Includes an upper and lower plate. Spacing between the mounting holes is 23mm center to center. Other spacings availabe on request.