The Hinderer Knives present's a fully tactical pen which is the best for writing and for CQB tasks The Investigator model is an 4.375" sleek pen with an black ink type and a cap mechanism. This model comes in an Matte Blue finished Aluminum built which has a good grip while performing writing tasks. The cap is precision threaded bullet tip which is sharp and has the same toughness as compared to the boker plus's kubaton model. The Investigator Pen uses a replaceable Fisher Space Pen cartridge. Made in the USA.