I obtained this as a Felissimo novelty item. This adorable hot water bottle features an oden pot illustration, perfect for combating the cold. This eco-friendly hot water bottle can be reused by boiling it in a pot for 5 minutes after use. (The design is difficult to see, so the third photo is reprinted from the Felissimo website.) - Design: A hot water bottle featuring illustrations of interesting ingredients sold by Felissimo. - Size: Approximately 8.4cm x 9cm - Material: Metal, Stainless Steel - Function: Heat retention, cold protection Thank you for looking.