Kuke Silicone Bowl Lids,Reusable Suction Seal Covers for Bowls, Pots, Cups. Food Safe High quality food grade silicone material Fit for a wide variety of sizes ,shapes,and materials including : stainless steel,glass,plastic,ceramic,and even wood. Material: Silicone Unique designs cover a range of container: pots,pans,casserole dishes,and various kinds of bowls. Heat-resistant from -40 Centigrade to 230 Centigrade.