Circular rotary replacement blades for Olfa's 28 mm rotary cutters are used for quilting, sewing and general crafts. These blades are made of high quality tungsten carbide steel for unparalleled sharpness and superior edge retention. Great for small-scale projects, miniatures and tight corners. Olfa 28 mm rotary blades, 5 pack, for the RTY-1/G rotary cutter.