This is a T-fal seal lid (18cm). It's useful as a lid for temporarily storing food. You don't need to transfer the food to another container, which reduces the amount of washing up. It came with a set I purchased, but I already have one, so I'm selling it. - Brand: T-fal - Material: Polyethylene - Size: Approximately 24cm in diameter - Purpose: Food storage cover - Retail Price: ¥1,056 Thank you for looking.