Fu An steel, says Chen, was plenty sharp but easily lost its edge, while leaf-spring steel from old vehicles was just right for working because it was softened through long use. The problem with leaf-spring steel, however, was that the shaft of the finished sword broke easily.
陳天陽強調，以往鑄劍因缺少鋼質，所以劍雖然鋒利，卻很容易崩口，避震弓板是一種含有鋼鐵的彈簧鋼，由於已經使用過，柔軟度很適合打造，缺點是劍身容易折斷。