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, called "zhoutou" (軸頭), are at the far ends of the wooden bar and helps with rolling the scroll up more easily. These could be ornamented with a variety of materials, such as jade, ivory, or horn.