The Epson C13T05B140 is the black XXL ink supply unit for the Epson WorkForce Pro WF-C879R A3 colour business inkjet multifunction printer. It is rated for about 86,000 pages, which makes it the highest-capacity black supply for this printer and keeps the cost per page very low for busy departments. The WF-C879R uses Epson's replaceable ink bag system, so large-volume ink units like this one let the printer run for long periods without supply changes. Genuine Epson ink is formulated for the PrecisionCore printhead and the pigment inks give sharp, water-resistant text. The unit is supplied in a sealed Epson box and slides into the ink compartment at the front of the printer. Epson notes the ink contains preservatives that may cause an allergic reaction, so follow the label when handling. After comparing online prices, www.marvel.co.za should be the cheapest on this product.