This item was purchased by my brother in Bolivia 33 years ago and has been stored at my parents' house. Length: Approximately 37.5 cm Inner Diameter: 18mm Outer Diameter: 28mm *I am not an expert on the kena, so please make your judgment based on the photos before purchasing. *There are no noticeable stains or scratches, but there are some minor scratches. (Please understand if I have overlooked anything) Please understand that this is a used item that has been stored at home for a long time before purchasing.