Brother TN300 High Yield Compatible Toner Cartridge for the Brother DCP-1000, FAX-2800, FAX-2900, FAX-3800, IntelliFAX-2750, 2800, 2900, 3800, 4800, 6800, MFC-4800, MFC-6800, PPF-2800, PPF-2900, PPF-3800. Toner Refill Store offers a 100% Guarantee on all of its products. Guaranteed to or meet or exceed current OEM standards and comes with a Lifetime Warranty