The Ruyi Golden Hoop is a weapon used by Sun Wukong in the Chinese Ming Dynasty fantasy novel "Journey to the West". According to the original text of Journey to the West, the shape of the Golden Hoop Rod is a long rod with golden hoops at both ends and a piece of black iron in the middle. A line of engraved words is engraved next to the hoop: "Ruyi Golden Hoop Rod, weighing 13500 pounds"; When it first appeared, it was a large iron pillar that was as thick as a bucket and over two zhang long. When it reached Sun Wukong's hands, it turned into an iron rod that was two zhang long and the thickness of a bowl mouth. When not in use, it can turn into a small embroidery needle hidden in the ear, and can change size according to Sun Wukong's will.