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Clever Supplies brand products are made in the USA! Why pay more for cheaper product with a high defective rate? You will end up having to send it back to the manufacturer. Get a quality product that you KNOW will work. Purchase the Clever Supplies Products Compatible for Samsung ML-4050 (ML-D4550B) Toner Cartridge Black and experience the difference! All Clever Supplies brand products are backed by '100% Quality Satisfaction' 1 year warranty against defects in materials and workmanship for all toner products. Free tech support for a Clever Supplies problems for all Clever Supplies brand products. The use of Clever Supplies brand replacement laser toner cartridges and supplies does not void printer warranty. Premium Quality Replacement Toner Cartridge is made by ISO9001 Certified Factory to Meet or Exceed OEM Standards. These units are manufactured 100% brand new with all new parts including OPC drums, wiper blades, a smart chip and other internal parts, they are an economical alternative to expensive OEM ML-D4550B, Compatible Toner Cartridges. This is a Compatible for Samsung ML-4050Toner Cartridge Black guaranteed to perform with Samsung Laser Printers. It replaces the original Samsung ML-4050 toner cartridge ML-D4550B Black. The compatible replacement for ML-D4550B. We offer a 100% Quality Satisfaction Guarantee on our Compatible for ML-D4550B Laser Toner Cartridges and supplies. For use in the following printers: ML-4050, ML-4050N, ML-4550, ML-4551N, ML-4551ND, ML-4551NDR