COMPATIBILITY - These ink cartridges are the industry standard and compatible with almost all standard printing calculators and adding machines. Specific models are included in the photos.
RED & BLACK INK - Comes with two colors: Black for addition and Red for subtraction.
HIGH QUALITY - The cartridges are high quality and long-lasting.
EASY TO READ - Ink resists fading and makes your prints look sharp and vibrant.
QUICK INSTALLATION - Takes less than 30 seconds to install. Refer to your machine's instruction manual for further instructions.