Fiberglass Solid wood Solid wood core (a layer of veneer over solid wood) Metal (Note: make sure metal doors are reinforced inside and have what is called a lock block. Otherwise, they can be bent out of the frame using a car jack)
If you do have sliding glass doors, glass door panels or nearby windows, however, cover the glass with a security grate or grille on the outside or a clear, unbreakable polycarbonate panel secured behind the glass on the inside.
