X-Acto - No. 1 Precision Knife - Carded - When your craft demands a precise cut, choose the X-ACTO No. 1 Knife. All knives include the No. 11 blade for the delicate cutting of light weight materials such as paper, plastic, balsa, thin metal, cloth, film, and acetate. Choose from the standard aluminum handle, the X2000 handle for increased grip, or the Gripster for soft grip. Xacto No. 1 Knife Handles also fit the No. 10, 12, 13, 16, and 17 blades. Type A Knife.