Boker USA Boker Plus Redox Pen . 13" overall. Pocket clip. Does not require a refill and works completely without graphite abrasion or ink. Instead it takes advantage of the rapid oxidation that occurs when the ethergraf tip comes into contact with paper. Once written down it can neither be erased nor wiped away. Titanium body. Boxed. Specifications for Boker Plus Redox Pen: Manufacturer: Boker Plus Additional Features: Pocket Clip. Length: 5.13 in Overall Length: 5.13 in Package Contents: Boker Plus Redox Pen