Traced copy attributed to the Tang calligrapher Feng Chengsu 馮承素 (617–672). Widely regarded as the most faithful of all extant copies of the Preface, for it preserves a number of details that other copies do not. Also called the Shenlong copy (神龍本), due to the small half-seal at the head from the Shenlong Era (705–707) of Emperor Zhongzong of Tang.
Due to its status as the most faithful copy, it is the one most widely reprinted in art history textbooks and calligraphy manuals.
Ink on paper, bound in a handscroll. Housed at the Palace Museum, Beijing.