This is the genuine Epson yellow ink pack for the Epson WorkForce Enterprise WF-C21000, Epson's high-speed A3 colour line-head inkjet multifunction system for busy offices and print rooms. Each pack is rated for approximately 50,000 pages, so the machine can run for long periods between ink changes, which suits high-volume departments that want low running costs and little intervention. Using original Epson ink keeps colour output accurate and protects the printer's line head. The ink pack comes in a slim box measuring about 115 x 580 x 30 mm and weighing 1.17 kg, and Epson supplies a safety data sheet on request. Each box contains one yellow ink pack. Please check that your machine is a WorkForce Enterprise WF-C21000 before ordering, as this ink does not fit other Epson printers. After comparing online prices, www.marvel.co.za should be the cheapest on this product.