BC-12e Photo cartridge contains one printhead & three BCI12PBK & three BCI12PC Ink Tanks. This is the photo cartridge for the portable color printer. It is comprised of 3 individual components - the print head, a photo black ink tank (BCI-12PBk) and photo color ink tank (BCI-12PC). Each element has a different life, so when either ink tank is exhausted, it can be replaced without the expense of replacing the whole unit. The photo black lasts approximately 35 pages and the photo color for approximately 30 pages. You will probably need to replace the whole unit (BC-12e) only when you detect deterioration in print quality. This will ensure optimum print quality