Olfa 45mm Rotary Blades are circular rotary replacement blades for Olfa 45mm rotary cutters. These popular blades are used for quilting, sewing, and general crafts. Perfect for cutting up to 6 layers of fabric. These blades are made of high-quality tungsten steel for unparalleled sharpness and superior edge retention. For Original 45mm Rotary Cutter, Deluxe 45mm Rotary Cutter, and the Splash 45mm Rotary Cutter. 5 blades per pack.