If You Care Baking Cups are made from FSC certified, unbleached, totally chlorine-free (TCF) greaseproof paper. They are coated with silicone, derived from silicon – which is non-toxic and abundant in nature, found in sand and quartz. This product is chlorine-free, so no chlorine or chlorine derivatives are dumped into lakes, rivers and streams. These cups are 100% certified compostable, even in your home compost. If You Care Baking Cups are microwave safe and oven safe up to 220°C. This product is also vegan and vegetarian friendly.