Olfa Rotary Blades are made of high-quality stainless steel to which a unique sharpening process is applied. Rotary Blades perfect for cutting strips and multiple layers at once. Cuts fabric, paper, tarp, vinyl, upholstery and more. For use only with the Olfa 45 mm Deluxe Rotary Cutter (sold separately). 45 mm Pinking - puts those familiar "teeth" on the edge of the fabric, for a look that's both decorative and functional.