This 2 pack black compatible Xerox 113R00712 high yield replacement toner cartridges are compatible with the following printer models: Xerox Phaser 4510, Phaser 4510/B, Phaser 4510/DT, Phaser 4510/DX, Phaser 4510/N, Phaser 4510/ YB, Phaser 4510/YDT, Phaser 4510/YDX, Phaser 4510/YN. Laser Tek Services® replacement cartridges offer an excellent choice over expensive brand name toner cartridges for your printer. They are professionally manufactured to produce the best quality prints for your Xerox printer. All of our replacement cartridges have new internal parts including OPC drums, Smart Chips, wiper blades, and a fresh supply of toner for premium performance giving you quality, clean and clear prints page after page. As always, all of our cartridges come with a 100% Satisfaction Guarantee! This package contains 2 black 113R00712 (4510) high yield replacement toner cartridges with an approximate page yield of 19,000 pages.