The IK Cartridge 278A Ultimate likely refers to a type of toner cartridge designed for use in specific laser printers, although it's not a widely recognized name in the toner cartridge market. The "278A" in the name suggests it could be a compatible or replacement cartridge for printers that use the HP 278A series, which is commonly used in HP Color LaserJet Pro series printers.

If you are referring to a specific third-party toner cartridge, the term "Ultimate" might imply that it is marketed as a high-performance or premium version, possibly with higher yield or improved print quality.

To give more specific details, could you clarify if you mean a third-party toner or a specific printer model you're working with?