This is the sharpest, strongest, replacement razor-knife available, with blades that change safely and easily at the push of a button. The black-oxide coated blade holder supports the razor-blade for the strength of a standard knife and sharpness of a surgeon s scalpel. The 3.5 inch Japanese 420J2 stainless razor-blades are precisely heat treated and hand finished shaving-sharp. The one-piece Grivory polymer handle features a Trimond texture pattern for a nonslip grip, even when wet. The double sided thumb stud allows easy, one-hand opening and the replaceable pocket clip contours with the handle so it feels like an integral part of the grip. The Onyx EDC comes complete with three replacement blades. Product Specifications Blade: 3.5 in / 8,9 cm Overall: 8.0 in / 20,3 cm Razor-Blade Steel: Japanese 420J2 stainless Blade Holder: 420J2 stainless with black-oxide coating Handle: Grivory (glass/nylon) Pocket Clip: Grivory Total Weight: 2.6 oz / 77 g