Kuke Silicone Bowl Lids,Reusable Suction Seal Covers for Bowls, Pots, Cups. Food Safe DURABLE MATERIAL: Silicone, Rated -40F / -40C to 446F / 230C. MULTIPLE USE: stainless steel,glass,plastic,ceramic,and even wood in the microwave, refrigerator UNIGUE DESIGN: Anti-scalding round handle, non-slip EASY TO CLEAN:hand washable,dishwash WARRANTY: We, Kuke, years-brand silicone products supplier, provide customers with life-long technical advisory, any questions about our products; we are here ready for help