Greenware Plant Fiber Blend Containers are made with a blend of wheat straw and wood fiber. There is no disruption to the food chain with products made from wheat straw. Our wheat straw is grown in Idaho within a 20-mile radius of our manufacturing facility, reducing transportation and emissions and environmental impact. A powerful combination of performance and sustainability, we have the all-natural solution to your take-out needs. Freezer safe, microwaveable and suitable for uses up to 300F.