High quality, sharp and durable rotary cutter replacement blades are a must for any fiber artists or quilter. These rotary blades are designed with durability and longevity in mind and are perfect for any fiber art purpose. Each blade goes through multiple sharpening stages so that you get the longest lasting blades possible. ThereÃs nothing like starting a project with a quality blades, and youÃll notice the how much better these blades cut immediately. These rotary cutter blades are made from strong tungsten SKS-7 alloy tool Japanese steel to ensure that they last as long as possible and that they stay sharp through multiple uses and it is ideal for cutting multiple layers of fabric, paper, felt and vinyl at once.