Craft knife blade is made with 100 percent zirconium oxide, an advanced ceramic material, to provide a number of useful features that set it apart from typical steel blades. Zirconium oxide is nonsparking, nonconductive, nonmagnetic, chemically inert & never rusts. Slow-to-dull blade starts at an effective sharpness & retains its safe cutting edge for up to 11 times longer than steel for consistently smooth cuts again & again. Its natural edge retention utilizes a finger-friendly grind to resist piercing skin while maintaining its high-quality cutting performance. Plus, its safer edge eliminates the need for special sharps disposal boxes. Rounded tip blade is designed for use with Slice craft knives, scalpels, precision knives & safety cap craft cutters (each sold separately).