I believe these are Umoregi Kogei (buried woodcraft) tea trays. 5 pieces. There is another set as well. Approximately 8cm x 12.5cm. These have been stored for a long time. Antique item. Umoregi Zaiku (buried woodcraft) is a traditional craft of Miyagi Prefecture, dating back to the Sendai domain era, using "umoregi," wood that carbonized underground about 5 million years ago. The jet-black texture, beautiful wood grain, and luster from the wiping lacquer are characteristic. Tea utensils and trays are made using the "kurimono" (hollowing) technique, which involves carving with a hatchet and chisel. Please take a look at the images and make your purchase based on your own judgment. Thank you very much.