Laser Tek Services&reg; 4 pack - 1 TN331K, 1 TN331C, 1 TN331Y, 1 TN331M Compatible Toner Cartridges for Brother: HL-L8250CDN, HL-L8350CDW, HL-L8350CDWT, MFC-L8600CDW, MFC-L8850CDW Package Contains 1 Black, 1 Cyan, 1 Magenta, and 1 Yellow Cartridges Works in the following printer models: Brother: HL-L8250CDN, HL-L8350CDW, HL-L8350CDWT, MFC-L8600CDW, MFC-L8850CDW Page Yield: 2500 pages per black cartridge, and 1500 pages per color cartridge at 5 % coverage Product Comes with a 1 year 100% Satisfaction Guarantee! Laser Tek Services offers free technical support for any questions you may have. Manufactured by ISO and STMC certified facility. 100% Guarantee on all of our products!| The Use of Laser Tek Services compatible products will not void your printers warranty.