Used in Monroe X Series Printing Calculators: 6120X, 2020PlusX, 122PDX, 8130X, 8145X, and UltimateX. With Monroe's M33X printing calculator ribbon cartridge you'll never have to worry about a messy installation process ever again! The NEW Monroe M33X Black/Red Ribbon Cartridge is the first-ever Monroe ribbon cartridge that can be used across an entire line of Monroe printing calculator models. This ribbon cartridge is compatible with all Monroe X Series printing calculators, featuring the highest standards in the calculator industry.

Monroe's ribbon cartridges produce the darkest printing black/red ribbon cartridges on the market using our exclusive True Red™ color. True Red ink is the perfect red specifically made by Monroe and doesn't have the orange tint you see in watered-down versions from other brands. Our ribbon cartridges have the highest possible inking degree, and are virtually smudge-free! To maintain the darkest print, we recommend users change their Monroe M33X ribbon cartridges after replacing 2 paper tape rolls.