It is a rectangular cone, slightly arched, white or yellow-white, with a slightly blue-gray base.

Young branches have "bloodshot" or purple-black markings in light perspective, smooth as jade, without cracks, and old branches have fine longitudinal cracks. In addition to the tip part, there are 10~ 16 raised ring ridges with an interval of about 2cm, which are held by hand, and the four fingers are just embedded in the depression, commonly known as "grip". The cross section of the base of the horn is round, with a diameter of 3~4cm, and there are hard and heavy corner columns in it, commonly known as "bone plugs". The length of the bone plug accounts for about 1/2 or 1/3 of the total angle, and the longitudinal edges with protrusions on the surface are closely embedded with the grooves in the outer corner sheath. Seen from the cross section, the joint is serrated.

After removing the "bone plug", the lower part of the corner becomes hollow, and the whole corner is translucent and transparent to light. There is a faintly discernible fine hole in the center of the upper part, which goes straight to the tip of the corner and is known as the "Eye of the Sky".