11 inch diameter (27.94 cm). As seen on TV. Securely stores in your microwave so it is always ready for use. 4 microwave safe polymer encased magnets. Steam Vents: Built in to help prevent foods from getting soggy. Universal Fit: Fits over most plates, bowls & platters and fits inside most microwaves. Easy Clean: Top rack dishwasher safe or rinse clean. Steam vents. Top rack dishwasher safe. Food & microwave safe. 11.0 in diameter universal fit. Product color and appearance may vary. BPA free. Made in China.