Around the size for a 5-year-old for Shichi-Go-San (7-5-3 Festival). Total length is approximately 19cm. From the bottom of the thong's tip to the heel is about 15cm, so I think the foot size would be around 17-18cm. Probably unused, but I'm not sure. It's old, but in very clean condition. I don't think there's any deterioration, but please consider it for photography purposes. There may be some minor scratches or dirt due to storage, so please understand.