19 Roofing, not of metal, incorporating photovoltaic cells; roofing fabrics; roofing, not of metal; roofing tiles, not of metal; roofing, not of metal; roofing plate (non-metallic -); all the aforementioned goods, insofar as they contain photovoltaic systems, photovoltaic solar modules, photovoltaic solar collectors or photovoltaic solar cells.