This is a Campbell 909 HO Roof-Mount with Frame Skylights (Plastic) (2). This is a complete eight pane skylight set, 2 per bag . These skylights can be used with or without the translucent glazed windows. If used without glazing, you'll are able to see, without obstruction, inside your structure. The small parts, such as these, are made from ABS thermoplastic and injection molds. The skylight boxes and frames are molded in black plastic, but can be painted any color required. The glazed windows are a clear-translucent which brings light into the building.