A vibrant set of 5 goldfish-patterned coasters, a lovely item to add a touch of coolness in the coming season. I think they'd be cute as decoration too. The material is likely thin paper, like washi paper, for the base, and the surface is thoroughly waterproofed. They have probably been used a few times, and there are stains and dirt on the box. Please purchase only if you understand the condition, as they have been stored at home.