Preserve tonal accuracy in photo and proofing workflows with a compatible gray cartridge designed for Canon PIXMA Pro printers. The PCI Brand Compatible for Canon 6390B002 CLI-42GY Gray High Yield Ink Cartridge is built for users who depend on stable neutral output, smooth gradients, and repeatable results from a desktop photo printer. This cartridge is compatible with Canon PIXMA Pro-100, Pro-100S, and PIXUS Pro-100 models, making it a practical replacement option for studios, in-house creative teams, and advanced home users who print with intent. Gray ink plays a specific role in image quality: it helps control shadow detail, reduce color casts, and support balanced monochrome and color prints. As a compatible supply, it gives procurement teams a lower-cost alternative to OEM replacement without changing the printer platform or the workflow around it. The high-yield format is especially useful in environments where print consistency matters and supply changes should be infrequent. For buyers comparing cartridge options, this model offers a focused value proposition: precise compatibility, gray-channel support, and a supply profile suited to premium photo output. It is a sensible choice when the printer is already the right tool and the consumable needs to match its output standard.