Cobra Tec Knives BOTFP OTF Tactical Pen W/1.75" Stainless Steel Blade 6061 Aluminum Black Cobra Tec's OTF Tactical Pen Is One Of a Kind. It Is Made Of T6061 Aircraft Grade Aluminum. It Has a Switch That You Push Up To Deploy The 1.75 Inch 440C Stainless Steel Blade And Push Down To Retract. It Comes With a Safety Feature To Prevent Accidental discharge. It Is Also a Writing Pen And Comes With a Extra Ink Cartridge. This OTF Tactical Pen Is a Great Self-Defense Tool. Type: Tactical Blade Length: 1.75" Oal: 5.78" Blade Material: 440C Stainless Steel Edge Type: 6061 Aluminum Sharpener Type: Black No. Of Blades: 1