Our Valona Organic Collection is made with wheat straw which is a microwave safe material made with wheat straw + food-safe polypropylene. These dinnerware pieces are truly unbreakable thanks to this new eco-friendlier material. Being completely durable and shatterproof makes them ideal for both indoor and outdoor entertaining. Measurements: 5.9" diameter, 19oz. Set of 4 bowls. All products are completely BPA-free and food safe. CARE INSTRUCTIONS: All products are completely BPA-free, food and dishwasher safe. Not suitable for the microwave.