Circular rotary replacement blade for Olfa's 18mm rotary cutters. Used for quilting, sewing and general crafts. This blade is made of high quality tungsten carbide tool steel for for unparalleled sharpness and superior edge retention. Ideal for intricate cutting, small-scale projects, cutting along curves and tight corners. For use with the 18mm Rotary Cutter (RTY-4) and Rotary Circle Cutter (CMP-3). 2 blades per pack.