Muyu Stone: it is also called Muwen Stone (stone with grain of wood). According to prospecting of geological experts, this kind of stone belongs to marine deposit, 550,000,000 years before present; the stone takes on brown color, and it is smooth in surface, delicate in texture and clear in grain; therefore, it is superior natural material for handicraft. Moreover, using this kind of stone to make health protection tea set can inhibit tea from degenerating; in addition, it can produce some microelements and mineral matter good for human body, so it has the functions of accelerating the development of human body, fighting against senium, preventing hypertension and arteriosclerosis; it is even sold to Taiwan and Southeast Asia.