An eight-Jin gong with female fingerprints on one side is a traditional large-scale palace gong in China, also known as "Big Gong", "Gong Chao" and "Gong Gong". This kind of gong is generally more than 80 cm in diameter and weighs more than 8 kg. It is one of the important instruments in the court band. Mother finger print refers to the handprint with a large depth and similar shape to the mother finger left on the gong surface. The existence of the mother finger print can increase the ringing effect of the gong surface and make the tone of the gong more profound and powerful.