Swallow -stone，Also known as the bat -stone，Scientific name is trilobite fossil. Swallow Stone Crafts has a long history in China, there were different kinds of Swallow &＃8211;stone crafts Said "multi-Fu yan"、"Hong Fu Yan" for viewing During Ming dynasty and Qing dynasty.The Swallow stone crafts were deeply loved by some calligraphy, Art, Intellectual person .Especially in recent years, were also selected as gifts to foreign heads and international friendsIt is deeply loved by the people all over the world