OLFA 9mm Ultra-Sharp Black Snap Blades are sharper than standard silver blades by up to 25%. Crafted from premium Japanese carbon tool steel for durability and dual-honed to provide precision results. Use these 9mm blades for fine, detailed cutting such as wallpaper, masking, and more. Each blade offers 13 sharp segments that are easy to snap when you need a fresh edge. Etched grooves provide a clean break and allow you to keep working with ease.