Olfa UltraMax? blades (ABB), knives, and cutters are exclusively designed for maximum cutting performance. These replacement blades are developed using a 'special' double honing process for superior sharpness and are 25% sharper than our standard (AB) blades. 13 cutting edges per blade strip. 10 pack features 130 cutting edges. Fits the SVR-1, SVR-2 and XA-1."