The X-ACTO X-Life #11 Classic Fine Point Knife Blades are the perfect accessory to a true tool of precision. When elaborate, detailed cuts need to be made, the #11 blade is the one to choose. Because the blade is made with quality sharpened carbon steel, you can make the most detailed, meticulous cuts knowing that the blade can stand up to the pressure. These blades provide superior sharpness and extended life! Each blade is blue oxidized to prevent rust and increase durability. X-ACTO knife blades are crafted with quality, carbon steel sharpened for a reliable cut and a strong blade. X-ACTO knife blades fit with most X-ACTO knife models.