Circular rotary replacement blade for Olfa's 45mm rotary cutters. Used for quilting, sewing, and general crafts. This blade is made of high-quality tungsten steel for unparalleled sharpness and superior edge retention. Cuts up to 6 layers of fabric. For Original 45mm Rotary Cutter and Deluxe 45mm Rotary Cutter. 10 blades per package.