The two knobs, at the far ends of the wooden bar, helped rolling the scroll up more easily and could be ornamented with a variety of materials, such as jade, ivory, or horn.
The two knobs helped rolling the scroll up more easily. This was at the far ends of the wooden bar. The two knobs could be ornamented with a variety of materials. This was at the far ends of the wooden bar. This was such as jade. This was such as ivory. This was such as horn.