These replacement blades feature a long lasting cutting edge designed for the 604 Series Mobius & Ruppert desktop and hand sharpeners. Never miss a beat with extra blades on hand, a quick switch allows you to continue writing, drawing, and creating uninterrupted with your go-to writing utensil. These quality blades are suitable for a variety of projects.Details:Blue box10 bladesMade with tempered steelMade in GermanyDesigned for 604 Series Mobius & Ruppert