The HMM Gun Metal Ballpoint Pen is made of aluminum alloy, and weighs only 22g for light and comfortable use. It has a heavy-duty spring that is used for the click structure to give it a sturdy and resolute hand feel. To get the color it is processed through military-grade hard anodizing for greater hardness, where the surface is anti-scratch and anti-corrosion, giving a unique style to writing that becomes ever more distinctive with time. A great gift for any professional in your life!