"Sinanpei" is common in Han tombs, especially in Eastern Han tombs, but it is flat and thin, and the perforation of ties is slightly different. Its name is now commonly known as "Gong" because of its shape and Chinese character "Gong", but according to literature records, it should be called "Sinanpei" in Han Dynasty. Sinanpei is a kind of Yu Pei often worn by nobles in Han Dynasty. Sina is a guide spoon on ancient guide tools. The top half of this page is engraved with a spoon-shaped thing similar to Sina, which means not to get lost, and it has the significance of seeking advantages and avoiding disadvantages.
Sinanpei's shape is a combination of two rectangular columns, with a spoon above, a disk below and a waist in the middle. There are horizontal holes in the groove, which can be hung through. Sinanpei was first unearthed in the tombs of Han Dynasty, and the jade is white. There were also imitations in the Song Dynasty, and jade articles mostly included osmanthus flowers and cow hair patterns. However, compared with the Han Dynasty, various parts of the utensils showed the characteristics of natural transition. Sinanpei in Ming Dynasty has sharp edges, tough lines, I-shaped or cylindrical shape, good polishing technology and strong glass light sensitivity. In the Qing Dynasty, the traditional top spoon shape was changed, some were bird-shaped and some were square, the waist groove of the utensil was deep, and the edges and corners of the utensil were smooth and shiny. Those with holes can be used as decorations, and those without holes can be used as decorations. Meiyu is made of brittle jade and then boiled in thick dark plum water all day and night. The pine part of jade is searched empty with boiling water, just like the trace of water shock, and then dyed by oil pressing method, imitating the people who suffered from water erosion in ancient jade.