The wing is covered with lightweight mylar. This extremely thin plastic film can be very difficult to handle due to its fragility and static cling. There are a number of different techniques to cover the wing. The simplest is simply to flatten out the film on plane surface and drop the pre-glued wing frame onto the covering. The works well with flat wing, but is more difficult for wings with a curved profile. To make the covering process easier, Torstensson uses this "cradle" made of hardwood, with balsa rails to fix the film onto.