From The ROCKSTEAD Website:Rockstead Knives are, in our opinion, some of the best production knives available on the market. With Rockstead’s meticulous craftsmanship and unique designs, this semi-custom folder is worth the premium price tag. The TEI-ZDP folder features a 3.625″ ZDP-189/VG10 clad steel, mirror-finish blade with blasted flats and durable anodized aluminum handles with stingray inlays. The opening action is smooth with a solid liner lock to securely keep the blade locked in place. The incredible mirror finish is achieved by heat treating the blade and gradually hand grinding through 400, 600, 800, 1,200 and 2,000 grits wet-dry sandpaper. This is very intense and time-consuming because if any scratches occur during this process, the blade must be sent back to the previous step for refinishing. Once this is complete, the blade will be buffed for the final finish. The folks at Rockstead have mastered this process to give the knife a beautiful finish and sharp edge like no other. Each knife is individually numbered and includes a certificate of authenticity.Clipped for tip up carry .Weighs in at 5.3 oz , serial # L123.