A razor blade having a substrate with a cutting edge being defined by a sharpened tip is provided where the substrate is comprised of a molybdenum (Mo) content of about 1.6% to about 5% by weight of composition and thicknesses of 1.60-1.75 μm and 9.25-10.00 μm measured at a distance of 4 and 40 μm from the blade tip, respectively. This thickness ratio is between 0.165-0.185. The substrate thickness is about 2.70-3.00 μm at 8 μm from the blade tip, about 4.44-5.00 μm at 16 μm from the blade tip with a thickness ratio measured at 4 μm and 8 μm between 0.56-0.62, and a thickness ratio measured at 4 μm and 16 μm between 0.32-0.40. The edge shape may be defined by equation w=adn with “a” between 0.50-0.62 and “n” between 0.76-0.80. A semi-included angle less than 7° is measured at a distance of 40 μm or greater from the blade tip. This substrate will have substantially no cracks.