Arteza 45mm Quilting Rotary Cutter Replacement Blades, Fits Olfa & Fiskars (SKS-7, Pack of 6) Set of 6 high-quality 45 mm rotary cutter replacement blades Comes in a case to keep the blades safe and lubricated Compatible with all rotary cutters, including famous brands Constructed from strong Japanese tungsten SKS-7 steel Easily cuts 4 layers of fabric and stays sharp longer than other blades