Silky saw blades are high-quality Japanese steel and are heat tempered on the cutting edges for long-lasting service. Most models are not designed to be sharpened but instead to keep their edge sharper much longer than traditional blades. However, some Silky saws are sharpenable using a specially designed Silky Feathered Edge 100m/m file. The file is wedge-shaped on either side to get right into the teeth of the saw. Sharpening a Silky saw blade requires plenty of patience!