This TS49 is a titanium frame lock with carbon fiber. Uses KVT ceramic ball bearings for smooth action. Twosun knives have been tested for good heat treatment of their D2 steel, 58-60 Rockwell Hardness. A great mid-range steel and at a nice lower pricing. A very premium built easy carry knife with all T8 hardware, even on the pocket clip. Weight 4.1 oz., Blade length 3.35", knife open 7.83", blade closed 4.4". It would be hard to find a knife of this quality for less than $135-$175 today.