TRUE IMAGE Compatible Toner Cartridge Replacement for Brother BRTN580X (Black) High Yield Black toner cartridge Expected Yield = 12,000 Pages at5% coverage ISO/IEC 19752 (letter/A79) Easy to install design Replacement TN-580 for Brother HL-5240,HL-5340D,HL-5350DN,HL-5370DW Warranty: Lifetime 100% satisfaction guarantee