This tiny Titanium Lockback Folder is based on the A.G. Russell Ultimate Pen Knife which we introduced mid-year 2003. The Pen Knife is a slip joint and measures only 2" closed. While it is an extremely handy and useful little knife, I saw the need for a knife that is just as thin (to rest comfortably in your pocket) but is a little larger and locks. Like the original, the 2.5 Titanium Lockback is made with top of the line materials - Titanium handles and VG-10 blade steel. To add a little elegance to your pocket, we have now added your choice of Abalone, Black Pearl or Chinese Quince handle scales. The 1-7/8" satin finished blade is VG-10 stainless at 59-61 Rc. Measures only 2-1/2" closed and weighs between 0.5 and 0.7oz. Made in Japan.