Victorinox 12" Roast Beef Slicer Knife, Black Fibrox Handle, 40543. Modern nylon and patented Fibrox handle is hygienic, dishwasher safe, slip-resistant and NSF approved. The handle is ergonomically designed to help minimize tension at the wrist and provides a much more comfortable grip than rosewood handles. A slicer serves a similar function to a carving knife, although it is generally longer and narrower. Slicers are often more flexible and as such are better suited for slicing ham or fish.