Thank you for viewing. This is a lidded yunomi (teacup). According to my father's notes, it's made of mokugyoseki (wood fish stone). My father collected these items as a hobby, and I am selling them to organize his collection. I am an amateur, so I do not know the details. Please make your judgment based on the photos and consider that these are used or antique items. For those looking for antiques, how about it? Product number 10054