This circular rotary replacement blade is for the popular Olfa 45mm rotary cutters used for quilting, sewing, and general crafts. Cuts up to 6 layers of fabric. The Olfa Rotary Cutter Blade is made of high quality tungsten carbide tool steel for unparalleled sharpness and superior edge retention. For Original 45mm Rotary Cutter (OLFRTY-2/G) and Deluxe 45mm Rotary Cutter (OLFRTY-2/DX).