A metal, oval-shaped yutanpo (hot water bottle) with excellent heat retention. I think it will be useful for use under the desk while working, or at bedtime. - Brand: Mannen Yutanpo (Everlasting Hot Water Bottle) - Model Number: OM 257003 - Material: Metal - Design: Striped design - Size: Oval There is rust, etc. Please check the photos. Please understand that this item has been stored at home for a long time, and refrain from purchasing if you are sensitive to such things. Thank you for viewing.