Matthew Martin is the son of renowned knife-maker R.J. Martin and it is clear the apple has not fallen far from the tree. This Martin pen is constructed entirely of flame colored zirconium. The fine thread pitch cap is easily removed and can be threaded on the non-writing end. The reverse side has a subtile, but effective point for striking and compliance techniques. The tip is unscrewed will accept either a Fisher or Parker refill. This titanium pen features a body of beautiful koa wood. Length: 4.8 inchesThickness: 0.5 Inches Weight: 1.4 oz. Cartridge: Fisher Space Pen pressurized