25mm round & "Made in Japan. These are pretty BIG! They have no finish on them as they were found in a warehouse basement in their raw state. Embellish them with Perfect Pearls (available in the Tools section) or any other medium you may choose for a finished look. Or... just leave them in their raw state for an earthy look. Colors vary from white to beige to brown. Some of the holes need to be poked through. They are really old.