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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 Okidata B4100 (42102801) 5 Black set 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 42102801, Compatible Toner Cartridges. This is a Compatible for Okidata toner cartridges Black guaranteed to perform with Okidata Printers. It replaces the original Okidata B4100 toner cartridge Black. The compatible replacement for 42102801. We offer a 100% Quality Satisfaction Guarantee on our Compatible for 42102801laser toner cartridges and supplies. For use in the following printers:B4100, B4250, B4300n, B4350n, B4200, B4300, B4350