This is a brand new, unused set of sake cups that I kept at my parents' house. I threw away the box during storage, so the material is unknown. As you can see in the photos, they have a cute, rounded design, so I think they would be good for things like boiled eggs or condiments. I think it's a rare item that can stand on its own without a stand. Stand diameter: 6.2 cm Sake cup rim: 5 cm