The 15-degree cutting angle on a No. 11 blade slices through paper, film, and thin materials with surgical precision. That acute point reaches into corners and curves where broader blades can't follow, making it essential for intricate stencil work, mat cutting, and model assembly. X-Acto manufactures these blades from hardened carbon steel that holds an edge through repeated cuts, maintaining sharpness longer than softer metals.

The pointed profile excels at piercing materials to start cuts, then transitions smoothly into controlled slicing along curves or straight edges. Graphic designers rely on these blades for trimming mounted prints and cutting window mats. Model builders use them for separating parts from sprues and scoring fold lines. Illustrators keep them sharp for precise paper collage work.

Each blade fits standard X-Acto knife handles with a simple friction fit, no tools required for changes. Replace blades frequently rather than working with dull edges; fresh blades cut cleaner with less pressure, reducing material damage and hand fatigue. Keep extras on hand since a sharp blade makes the difference between ragged tears and clean separations.