Amorim Cork 4 U 490527 Nature Cork Trivets, Oval Measures (approx.): 6", 8" and 10 Made of Natural Cork Protects surfaces from heat damage and scratches Multipurpose: use under flower pots, fish bowls, appliances, lamps, etc Clean with a damp towel. Do Not submerse in water. Do Not use in the Dishwasher. Oils may stain the cork. You can apply a coating of mineral oil to the cork trivet to help seal it and protect it from staining. By doing this the cork will become darker from the oil.