The Everprint CHIP-OKI-5800-5900-C is a cyan cartridge chip for compatible OKI printer supplies. It is listed for use with the OKI C5550, C5800 and C5900, making its purpose clear for those printer models.
The chip is specified for cyan and has a stated yield of 5,000 pages. It is a cartridge component, rather than a complete toner cartridge, and is intended for the listed printer family.
This replacement chip provides the identified colour and yield reference for the compatible cartridge application.