Ultramax 9mm replacement blades are designed for maximum cutting performance. Ideal for applications where superior sharpness is required, these high-quality, carbon tool steel blades are developed using a special double honing process for extreme sharpness (25 percent sharper than OLFA silver 9mm AB blades). Blade container doubles as a blade snapper/blade disposal container. Blades are 9mm wide x 0.38mm thick.