There are 11 overlays in this set. 9 butterfly wing overlays, 1 dragonfly wing overlay and the Tinker Bell wing overlay.
Each overlay is a left wing. To get the right wing, simply duplicate the layer with the wing on it then transform it to where you need it, either by Distort or Flip Horizontal. Check out my free tutorials on my website to learn all you need to know about how to do digital fairy wings.
Please feel free to ask any questions you might have.
To add the rainbow effect to the wings as seen in some of the gallery pictures, check out the video tutorial I made my free Photoshop tutorials page.