Fisher Space Pen Trekker Pen Black w/Key Ring Lanyard & Carabiner Clip FSP. This Tactical Pen manufactured by the professionals at Fisher Space Pen is the creation of countless hours and comittment to giving you a tactical pen that will be reliable and efficient. The Fisher Space Pens Trekker Tactical Pen w/Key Ring has the amazing ability to write underwater upside down at any angle in extreme temps and over grease. For the best available way to make sure you have a great writing utensil for any writing mission choose the Fisher Space Pens Trekker Pen w/Key Ring Specifications for Fisher Space Pen Trekker Pen w/Key Ring: Manufacturer: Fisher Space Pen Color: Black Length: 3.875 in Package Type: Gift Box Features of Fisher Space Pen Trekker Pen w/Key Ring Style: Snap Off Cap Length: 3.875" .375" diameter Cartridge: Fisher PR4 Pressurized Refill. Black Ink Medium Point Composition: Matte Black with Fisher Rubber Comfort Grip Packaging: Gift Box Package Contents: Fisher Space Pen Trekker Pen w/Key Ring Fisher Space Pen FSP725B: Trekker Pen Black w/Key Ring Lanyard & Carabiner Clip