PropsAndWheels Wings are EPS (expanded polystyrene, a.k.a. Styrofoam), not EPP (expanded polypropylene). EPP is a newer and more resilient foam than EPS. EPS brittle and breaks easily. I recommend covering at least the leading edge of the wing and the wing tips with tape to strengthen the wing, e.g. with duct tape or packaging tape.

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BG133438144 Definitelypolystyrene. Identical to packing foam. This is very weak material and not molded accurately. The wing halves are not aligned well and the plywood insert does not fit correctly.

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