Use this Bron Coucke #10644 Reversable 44-blade set to replace the collection of blades that came with your Bron Coucke 3839 Professional Mandoline. Designed specifically for use with the "Original" Mandoline, these blades are reversible. One side aligns to provide a 2 millimeter cut, and one side aligns to provide a 9 millimeter cut. These blades allow you the versatility of making cuts of various thicknesses, so you can accommodate whatever recipe you're making. Made out of special, hard stainless steel, these blades provide razor sharp, precise cuts. You'll be able to slice anything from potatoes, to onions, to lemons and limes with ease!