Epson 103 ink refers to a set of genuine Epson ink bottles designed for use with Epson’s EcoTank / refillable ink-tank printers. These aren’t standard cartridges but large ink bottles (typically 65 ml) that refill the printer’s ink tanks directly. The 103 ink series includes Black, Cyan, Magenta, and Yellow variants and is engineered for high-volume, low-cost printing with reliable quality and minimal waste.