Original Hewlett Packard toner cartridges are the best and most reliable way of running your mono laser printer, this is especially true for the genuine HP 87AS. With the toner powder required to print an estimated 6,000 pages on-board, the original Hewlett Packard CF287AS represents great value.You will find the genuine CF287AS to be compatible with the HP LaserJet Pro M501n and every other printer listed on this page. The purchase of the Hewlett Packard HP 87AS black toner cartridge is a guarantee of quality and efficiency from an original product.