Polishing wheel for carving jade

Circular object with a dark brown color and concentric rings. The object is flat and round, with a series of concentric circles. The circles are made of a lighter brown material, possibly a rope or cord, that has been wrapped around the center in a spiral pattern. The center of the object is lighter brown and has some darker spots. The background is a plain gray color. The object appears to be titled "Polishing wheel for carving jade" and is the work of an unknown artist.