Thanks for your question. PGI-550PGBK is a Black Ink Cartridge for your Canon MG7550, please see the link below; https://www.cartridgesave.co.uk/PGI-550PGBK.html

Please find a link below to the cartridges for your Canon Pixma MG6450. You can use the standard or High capacity cartridges in the printer.

http://www.cartridgesave.co.uk/ink-cartridges/Canon/Pixma-MG6450.html

Yes, the high capacity Canon CLI-551XL ink multipack is more economical and will give you a lower cost-per-page than the standard capacity CLI-551 colour cartridges. We're unable to give you exact costing but you can expect to print at least twice the amount of pages from the CLI-551XL multipack without paying twice as much. You can use either the CLI-551 standard capacity cartridges or this pack of high capacity Canon CLI-551XL inks in your Canon Pixma MG5550 printer depending on which cartridges are most suitable for you.

If your printer uses five cartridges then you'll need to have them all installed with some ink in each cartridge for it to work. The Canon Pixma MX925 printer requires an additional grey CLI-551/XL ink cartridge which isn't sold in this 4 colour Canon CLI-551XL multipack as the majority of printers only use four cartridges. Therefore, if you need the additional grey Canon CLI-551/XL ink cartridge you need to order this separately as a single item. Please click on the link we've provided for the single pack of grey Canon CLI-551GYXL ink: http://www.cartridgesave.co.uk/CLI-551GYXL.html

The item you're viewing is a pack of original high capacity Canon CLI-551XL ink cartridges for the Pixma MG6350 printer. These high capacity CLI-551XL cartridges will give you the cheapest cost-per-page from each colour in terms of genuine Canon ink. The Canon MG6350 printer also uses a genuine Canon PGI-550XL black cartridge which isn't included in this pack and must be bought separately. We also sell compatible ink cartridges for the Canon Pixma MG6350 printer which are non-Canon products and are the lowest priced cartridges that will work in your printer. Please see: http://www.cartridgesave.co.uk/ink-cartridges/Canon/Pixma-MG6350.html

Canon only express the capacity of these genuine CLI-551XL ink cartridges as a print yield based on how many 10 x 15xcm photos you can print at 5% coverage as indicated on our website. Each of these Canon CLI-551XL ink cartridges should contain approximately 11ml of ink but we would ask you to have this confirmed by Canon if you need the exact ink volume in ml for these cartridges.