This oval-shaped steamer is made of silicone, is heat-resistant, and is perfect for cooking in the microwave. I won it at a company bingo game. I'm selling it because I don't use it. The case has a sticker that says "10th prize." Brand new, unopened. In the last image, it's being sold on Rakuten for 4,060 yen. - Model Name: Silicone STEAMER OVAL - Material: Silicone - Temperature Range: -40°C to 230°C - Accessories: Recipe included - Design: Oval Thank you for looking.