The letters at the end of a number sequence in HP cartridges signify the cartridge’s ink volume. Many HP cartridges, as well as some other manufacturers, have a long sku, a short part number and, sometimes, even an alternative part number. For example, HP's #56 cartridge is also known as the 56A C6656, C6656A and C6656AN. These are all the same product and have the same ink volume, but are displayed using various shortened versions of the full part number, which is C6656AN. Most HP cartridges are available with different ink volumes. HP cartridges with different ink volumes are identified by a different letter at the end of the number sequence. For example, HP cartridge 51645G and 51645A are identical cartridges, but have different ink volumes. The "G" is the free starter cartridge that comes with a printer and the "A” is the regular high volume cartridge that is sold in stores. When our house-brand cartridges are manufactured, they are always filled completely. So, regardless of the letter at the end of the HP part number, or the letter at the end of the HP cartridge that you normally order, you will always get a cartridge with a high-ink volume from LD.
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