Circular rotary replacement blade for our popular 45mm rotary cutters used for quilting" sewing" and general crafts. Cuts up to 6 layers of fabric. This blade is made of high quality tungsten steel for unparalleled sharpness and superior edge retention. For Original 45mm Rotary Cutter" Deluxe 45mm Rotary Cutter and Quick-Change 45mm Rotary Cutter. 5 blades per pack.