The LENOX Gold 20350GOLD5C Titanium Edge Utility Blades - 5 pack have a high speed steel edge with titanium coating that keep the blades cutting after others have quit. The patented bi-metal construction allows the blades to bend and flex without breaking. The four notch system allows the blade to extend further. The LENOX Gold Titanium Edge Utility Blades fit all standard utility knives and are great for cutting drywall, insulation, flooring, roofing and more.