The IXINK1 Quadient Red Ink Cartridge is a compatible product designed for use with the Neopost iX-1 Series Franking Machine. This cartridge, with a size of 1 pack, contains 4200 pages of fluorescent red ink suitable for printing letters sized at 8.5 x 11 inches. Manufactured by Diroya, this ink cartridge is ideal for Quadient printers and offers a water-based ink base for high-quality printing results. The cartridge is lightweight at 0.44 pounds and comes with one pack, making it a reliable choice for those in need of red ink cartridges for their franking machine.