This is a glass lid that came with the Ingenio Neo IH Blue Marquise Unlimited set. The official website states the size is 19.1 x 19.1 x 2.3 cm. Although it has never been used, it was taken out of its packaging and stored with other lids. There are marks left from removing a sticker on the glass surface, and they wouldn't come off, so the glass surface is slightly cloudy. (I couldn't capture it well in the photos...) It is an unused item, but I hope to sell it to someone who understands that it has been stored for a long time and that the storage condition is not perfect.