Our Earth's Natural Alternative salad bowls are made from 100 percent sustainable and renewable natural wheat stalk fiber and Bagasse (sugarcane fiber). material is gluten free, Made from the plant stalk not grains. They are an environmentally beneficial alternative to plastic or Styrofoam, which contain non-biodegradable and petroleum derived materials, or paper, which requires the cutting down of trees. They are compostable in either a Industrial compost (1-6 months) or a home compost (up to 12 months). built sturdy from environmentally beneficial natural, renewable plant fibers, they can be used in the microwave - as they are heat safe up to 200 degrees Fahrenheit - and are oil/liquid and cut resistant. Their natural Tan, dye free, bleach free coloring is perfect for any occasion - picnic, barbecue, Church luncheons, holiday parties and get togethers, bridal showers, weddings, carnivals, fairs or everyday use.