NT Durable blades for the heavy-duty circle cutters (C-2500P, C-3000GP, CL-100P) and mat board cutter (OL-7000GP). This extra durable blade is thicker than the standard circle cutter blades. These heavy-duty blades are 1mm thick for heavy-duty jobs. 10 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.