The Ventilator is constructed from ultra-stiff hollow carbon fiber tubing, and has a penetrating point that is protected and concealed by a standard pen cap with a pocket clip. The opposite end is covered with a slightly tacky material to enhance the grip.
Carbon fiber is a high-tec material which is completely non-metallic, extremely strong, rigid, and way lighter than fiberglass. It feet s used in advanced aircraft, boats, sports equipment, etc. where performance is everything and cost is secondary.
Your personal last ditch self defense device is 6 inch in length and all black in color.