This is a mini-sized ink well. Convenient for when you only want to write a little, and easy to wash. The material is unknown, possibly resin or plastic. I purchased this new as part of a set, but I'm not using it, so I'm selling it. Can be used for calligraphy, as well as watercolor painting. Will be shipped in an OPP bag, then cardboard, then a Yu-Packet Post Mini bag.