It is a dry gallstone of bovine cattle. Is a valuable Chinese medicine.Taste and Meridian Gan, cool. Heart, liver.This product mostly oval, srical, triangular or square, different sizes, diameter 0.6 ~ 3 (~ 4.5) cm, a small of tubes in the accuracy of debris. The surface is yellow-red to brown-yellow, and some are covered with a layer of black and shiny film, which is called "black gold clothing". Some are rough, with verrucous protrusions and some are cracked with tufts. Body light, crisp, easy to delaminate layer