Our alternative remanufactured print cartridges to replace the Samsung 303E / MLT-D303E laser toner cartridges for use in the Samsung ProXpress M4560FX printer have a 100% Satisfaction Guarantee. These cartridges are not refurbished Samsung OEM cartridges. They are non-OEM products that have been modified and professionally remanufactured by a remanufacturer that is not endorsed or associated with Samsung and are guaranteed by 4inkjets.com to work with your Samsung ProXpress M4560FX Printer. They are a low priced alternative to Samsung OEM laser toner cartridges. Our remanufactured alternative cartridges for your Samsung ProXpress M4560FX printer have been manufactured to the highest performance and quality standards and will deliver optimal prints when used in your Samsung ProXpress M4560FX. These cartridges are also replacements for the 303E / MLT-D303E toner cartridges. Since we import our products directly from the remanufacturers we can pass the savings on to you.