NT Dual edge blades for heavy-duty circle cutter (C-2500P, C-3000GP) and large circle cutter (CL-100P). This extra durable double-sided blade is thicker than the standard circle cutter blades. These heavy-duty blades are 1mm thick for heavy-duty jobs. 2 refill blades are packed in a protective plastic container with a convenient hanging hole. These professional blades are made of high quality carbon tool steel and produced through multiple stages of precise process to obtain the ultimate sharpness and optimum edge-retention. Made in Japan.