X-ACTO knives are designed for maximum performance and precision. Always on the cutting edge, for decades X-ACTO has been the standard by which other cutting blades are measured. The X-Acto Z Series features our sharpest, most durable blade ever. Zirconium nitride coated blade provides an edge that is proven to be 5 times stronger and stays sharp 7-10 times longer than standard blades. Does an incredible job with delicate, precision cutting or trimming or stripping on paper, plastic, balsa, thin metal, cloth, acetate and other materials. A lightweight aluminum handle with easy-change blade. Includes #1 knife and cap.