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.