This is a popular 18-piece set of heat-resistant glass food storage containers from iwaki. You can take them directly from the refrigerator to the microwave or oven, and they are also dishwasher safe. I ordered an extra set in a lucky bag, so I'm selling this one. This 18-piece set originally retails for 17,875 yen. I opened the box once to check the contents. Brand: iwaki Condition: New, unused Material: Heat-resistant glass (microwave, oven, and dishwasher safe) *Although new and unused, there may be some minor scratches on the outer box due to home storage. Please understand.