X-Acto Blades come in many styles, each with a different use, and they are all extremely sharp. Pick the blade that best fits your project and find a handle that is designed for your blade. Use with caution and always wear safety goggles. Most blades and handles have color strips on the bottom of the package so you can easily identify which work together. #11 Z Series 5pc- The Z series blade is X-Acto's sharpest, most durable blade ever. It has superior sharpness and strength. Fits all type A handles. Package includes 5 blades.