The callus razor blades from the Zwilling Classic Instruments series serve as replacements for the corresponding callus razor in the Zwilling range. They are packaged in two small packs of 10 pieces each. Zwilling callus razor blades can be rotated after the first use, as both sides are gently sharpened. They can be easily locked into the blade holder using a sliding mechanism. With these blades, you can quickly get your callus razor ready for use again. 2 x 10 blades.