In the process of making glass instruments, except for tweezers, cutters, and a few other simple tools, the thickness, flatness, neck size, arcs, angles, and curves nearly all depend on the skill of the craftsman's hands and the control he has of his breathing.
儀器玻璃的吹製過程中，除了有吹氣軟管、鑷子、擴孔工具、切斷器等少數輔助工具，厚薄、平直、口徑大小、凹凸孔長短、彎曲角度、圓形弧度等，幾乎全靠雙手的拉力和嘴巴的吹、吸氣拿捏控制。