This is the sharpest strongest replacement razorknife available with blades that change safely and easily at the push of a button. The blackoxide coated blade holder supports the razorblade for the strength of a standard knife and sharpness of a surgeons scalpel. The 3.5 Japanese 420J2 stainless razorblades are precisely heat treated and hand finished shavingsharp. Rubberized TPR handles are mounted to sturdy stainless steel liners for unparalleled strength and a nonslip grip even when wet. Comes complete with six replacement blades.