We do not recommend metal kitchen utensils with our Xtrema cookware.  Metal can leach into your foods and because it is softer than ceramic it can leave metal marks on the cooking surface of Xtrema.  The good news is that you cannot scratch Xtrema and that these metal marks can be removed by using dry baking soda and a dry nylon scrub pad or dry Brillo pad. Just rub the metal marks away.  Rinse with warm water when done.