Catalogue entry no. 179 by Max Loehr:
179 Pair of Concave-walled Cylinders
Jade of two shades of celadon-green with cream-colored spots. The shape of these objects suggests that they were made by the process of biconical drilling with a hollow drill of appropriate dimension, and afterward polished smooth. The perforations are wide and flare at both ends. Probably Shang.