X-ACTO knives are the preferred cutting tool for a wide variety of professionals and hobbyists alike. Designers and artists love the X-ACTO knife"s ability to produce careful and meticulous cuts with consistency, while engineers praise the knife"s durable design and reliability. The X-ACTO Designer Series Number 1 Craft Knife offers superior precision cutting and ergonomic control. It features a front ball design to keep your finger from slipping into the blade area. Our number 1 craft knife is perfect for cutting lightweight materials, such as paper, plastic, balsa, thin metal, cloth, film and acetate. Made with a rear blade release and safety cap, this crafting knife was designed with safety in mind. The Number 1 Craft Knife also includes a number 11 blade, and can be fitted with number 10, 12, 13, 16, and 17 X-ACTO blades. The original X-ACTO knife has been praised for more than 50 years as the standard for precision. Attaining this level of precision, accuracy and reliability starts with supreme quality craftsmanship. All X-ACTO knives are built with a carbon steel blade for a reliable cut every time. Additionally, they are crafted with a sleek design that fits comfortably in the hand, allowing you to continue making the precision cuts needed to finish the job, no matter how long it takes.