Stanley 11-938 3-Pack Paper Utility Blades Edge is engineered for precision cuts on wall coverings, borders, paperboard and other light, sheet materials 50% sharper on average compared to Stanley's 11-911 Regular Duty Blade Blade stays sharp 80% longer on average to deliver more clean cuts and less tearing PAPER callout is laser etched on blade to prevent mixing with standard blades Limited Lifetime Warranty