Installing a genuine Samsung Black Toner Cartridge ensures fantastic and reliable output from your Samsung CLP-320 series laser printer. When each toner cartridge runs low, the corresponding colour indicator will start to blink red. Order a new cartridge as soon as possible and install it when the toner colour indicator shows a solid red. This twin pack of black cartridges has a yield of 1,500 pages per cartridge or 3,000 in total.