These are industry standard, disposable, Carbide Cutting Blades. Cutting Blades are small rectangular carbide pieces, that have one angled side, which creates a sharp blade surface. Only Horizon machinery uses Cutter Blades. They are designed to achieve approximately 400 cycles before they should be replaced with a new set. HOWEVER, with our available Sharpening Service, you can now have 3 TIMES the usability! After your 400 cycles, call in and/or mail in your Carbide Cutter Blades for a SUPERIOR Sharpening Service. Carbide Cutter Blades can be sharpened up to three times with the additional 400 approximate cycles after each. This SAVES time on calibration and money on shipping.