Type: Seal material These are items being disposed of by a pearl shop, so I don't have detailed information. They were stored with whale tooth crafts, so I believe they are seal materials made from whale tooth. I am selling 20 pieces together. The sizes vary. Approximately: The smallest are about 7 to 8 mm in diameter and about 4 cm long. The largest are about 8 mm in diameter and about 4.7 cm long. Due to presbyopia, it's difficult for me to see small numbers, so please understand that there may be some slight errors. I haven't done a detailed check, so I would appreciate it if you could purchase them with the understanding that they may have imperfections.