Hyuga Special Clam Go Stones, Genuine Nachi Black, Size 31 These were stored at home. As they were kept in their bag, they are likely unused. They were carefully stored in a dark room, but this is a check of a long-term home-stored item by an amateur, so there may be overlooked signs of age-related deterioration. We ask for your understanding. If you are even slightly concerned, please refrain from purchasing.