The truffle shaver has a razor-sharp serrated blade. The blade is adjustable from 1/8" at its thickest to so thin you almost can read through. The adjustment is made with a little knob. To use it, just...Black Truffle Imported from Italy* *Keep fresh truffle, in an air tight container full of rice, in the refrigerator, use within a week of purchase, or the truffle will dry out and lose fragrance.