From the manufacturer

X-LIFE #11 Classic Fine Point Blade

The X-ACTO #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 and steel, you can make the most detailed and meticulous cuts knowing that the blade can stand up to the pressure.

You won’t have to worry about these blades chipping or snapping. The X-ACTO #11 Classic Fine Point knife blades are available with a unique, blade dispenser that allows you to easily access the next blade when it is time to switch, safely and without hassle. The #11 Classic Fine

Point knife blade from X-ACTO works with a variety of materials:

Paper
Plastic
Soft woods

The X-ACTO No. 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 No. 11 blade is the blade 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. X-LIFE 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. The original X-ACTO knife has been praised for more than 50 years as the standard for precision.