Disk (<em>bi</em> 璧)

Perforated disk of the type pi [bi] 璧; bored from both sides, leaving median ridge; mottled bright shades of yellow and orange brown; profuse silvery area of incipient disintegration; strata running in thin layers, most noticeable on the rim where some have chipped off from erosion and decomposition. (Many rough and chipped areas on rim and surface.)