Walnut in Wan Wen is mainly made of hickory. Carya cathayensis is naturally grafted, mainly produced in Northeast China, Yunnan, Hebei, Shanxi, Shandong, Sichuan and other places, with Hebei producing the best appearance. Carya cathayensis is fine and hard. When it collided, the new walnut sounded strong and felt heavy. Old walnuts are as smooth as suet jade and collide like stones. The old walnut is very beautiful.