Premium SKH-9 Steel Blades: Made from high-speed steel (SKH-9) with four-stage sharpening for long-lasting sharpness, superior to SKS-7 blades. Visible Length Markings: Each 45mm blade features clear surface markings for quick, rough measurements while cutting. Ideal Cutting Tool: Perfect for quilting, sewing, arts & crafts. Cuts multiple layers of fabric, fleece, felt, leather, cardboard, wallpaper, vinyl, and more. Quick & Easy Replacement: Compatible with all 45mm rotary cutters for fast and safe blade swaps. Protective Packaging: Each set includes 5 blades stored in an oil-coated plastic box to prevent scratches and ensure safe storage.