It is a two piece wing. The halfs are joined by an aluminum joiner, and the root of the wing by an aluminum pin. Once bolted to the fuse, the tonge on each wing half and the bolts keep it from going anywhere. I glued the joiner in one half so I do not lose it. This is the plane I am teaching my six year old daughter to fly with, and my sunday afternoon plane. I love it, you will not find a better slow flyer.