X-ACTO X692 100pc X-Life heavy duty utility blades. X-Life Blades are made from the highest quality carbon steel, rigidly tested for hardness, and manufactured to the most stringent specifications. They are oxidized to resist rust and increase durability. Based on independent tests, the X-Life blades show a 30 percent sharper edge and have 54 percent longer life than competitive blades. Great for matboard, carpet, wallboard, wallpaper, tile, plastic, and wood. Made in USA.