This genuine MLT-D309L is a brand new product that came straight to us from Samsung and is guaranteed to give you the very best print quality available. Containing a black toner powder formulated to give smooth prints with sharp line and a variety of different tones, the original Samsung MLTD309 is astounding.You can expect to receive an estimated 30,000 prints from each of these Samsung MLT-D309L/ELS mono laser toner cartridges in the Samsung ML-5510ND and all other compatible printers. A full list of all black and white laser printers that can benefit from the Samsung MLT-D309L/ELS can be found on this page.