Eco Friendly: Made from renewable and reclaimed materials, natural wheat straw, starch, food-grade PP, which will self decompose in the soil. Unbreakable & degradable bathroom tumbler cups for all age of kids, adult and the old in the family. No heavy metal, BPA free food-safe grade and dishwasher, microwave, fridge and freezer safe. Cups are stackable to conserve space and the round design, no dead angle, easy to clean. Healthy cups for kids, designed on both esthetics and comfort, excellent color will not run or fade.