Here are four materials for a Japanese seal (inkan). Each piece is about 6cm long. I obtained these when I went to China. I was told that these are materials for carving seals. I was told the material is stone. However, I don't know what kind of stone it is, nor do I know if it's really stone. Please make your own judgment. There are no pets or smokers. Thank you very much. Thank you for looking. #inkan #insho #material #stone #hanko