Silicone Single Number Ice/Bake Tray Number 4 FDA-approved silicone construction ensures even heat distribution High-gloss nonstick finish releases foods cleanly and resists odors and flavors Nonstick surfaces, FDA approved, heat resistant up to 500 F Ideal for the oven, freezer, microwave and dishwasher Not just your regular ice tray,Number Iceventures beyond blocks, to spell out words and phrases to make events, holidays and everyday meal time fun and educational.