This is a bamboo masu (measuring cup). It has a "Fuku Masu" (Good Fortune Masu) stamp. Each side is approximately 5cm. It adds a nice atmosphere when used for events like Setsubun (Bean-Throwing Festival). I think it can also be used as a sake cup. This item is unused. As it is made of natural materials, there may be variations and imperfections. Please understand this before purchasing.