The Hewlett Packard CF237A toner cartridge is a standard capacity unit that offers the user the cheapest possible way to get up and running with a original product. Compatible with fine printers like the HP LaserJet Enterprise Flow MFP M631h, this HP 37A represents the very finest black and white prints on the market. Offering an estimated 11,000 prints, each of these genuine Hewlett Packard CF237A toner cartridges are great value. Although the HP 37A is one of the most reliable printing products on the market, Hewlett Packard still offer a full guarantee on the cartridge directly.