Made from high-quality steel, Olfa's replacement blades for Olfa rotary cutters feature superior edge retention and sharpness, allowing blades to tackle small and big projects. Olfa's 18mm and 28mm blades are ideal for trimming seams, scrapbooking, quilting, and more. The 45mm and 60mm blades are designed for heavy-duty cutting and can cut through multiple layers of fabric such as cotton, leather, suede, wool, fleece, and felt. Rotary cutter blades are available in a variety of pack sizes and quantities.