X-Acto - Modified No. 11 Blade - 5 Pack - X-Acto Modified No. 11 Blades are Broad Tip Knife Blades for precision cutting, detailing, trimming, and stripping. Cuts paper, plastic, cardboard boxes, balsa, bass wood, photos, and coupons. Xacto Modified Number 11 Blades have a broader tip blade that provides a stronger point. Fits 1/4 inch Type A X-ACTO or Excel Handles.