Copper based pans may leave marks on glass surfaces and any heavy pans that are dragged over the surface of the hob will result in scratches being left on the glass. Pans should be raised when being moved around the hob. Don't use abrasive cleaners on your hob as these may scratch the surface, a soft cloth and mild cleaning agent which may be purchased from the web site are suitable to get great cleaning results without damaging the glass surface