Xtrema 11" 100% Ceramic Wok Frying Pan with Cover & Red Silicone Handle Pot Holder Xtremas 100% natural ceramic, metal-free make is a healthy alternative to traditional cookware, which can leach unwanted metals into your food. Cook low and slow to avoid thermal cracks that will break cookware and void warranty. Make sure to oil your pan when cooking as Xtrema has no synthetic non-stick coatings. Xtrema cookware is sensitive to sudden temperature drops. To prevent sudden cracking, thaw frozen foods before adding to hot cookware and do not add cold water to a heated Xtrema pan. Hot skillets and pots can crack if placed on a cold granite countertop or a cold glass top burner. Though it has a non-scratch surface, use wooden and plastic cooking utensils for best results. Prevent harming your cookware by placing a soft towel in between them when stacking and storing to avoid chips and cracks. Xtrema makes for an extremely versatile product that can be used safely on the stove, in the oven, on the grill, or even the microwave.