For most cartridges this is based on 5% coverage on A4 paper. These numbers are based on manufacturer quoted values and are for comparison purposes only.
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REMEMBER... all third-party printer cartridges are NOT the same!

Our cartridges won’t damage your printer—guaranteed
Some people worry that own-brand cartridges might damage their printers. We know from experience that ours don’t.
To reassure you, we guarantee that we’ll repair or replace your printer—for free—in the unlikely event that it gets damaged by our own-brand cartridge. This is regardless of how old your printer is. We can afford to offer this as problems are almost unheard of.
Your printer warranty is safe
Some people whose printers are less than a year old worry that an own-brand cartridge might invalidate the manufacturer’s warranty. This isn’t true. By law, manufacturers aren’t allowed to invalidate your warranty if you use own-brand cartridges. If something does go wrong and our own-brand cartridges are to blame, we’ll take over the manufacturer’s warranty, offer you phone support and repair or replace your printer if needed.
In summary there’s zero risk in using our own-brand cartridges.

By William Woodman (softwood consulting ltd) on 2024-05-09 16:40:11
had ordered new oki drums and replacement cartridges. Deliver was very quick as ever 10 of 10. but the comptaible cyan and black didnt register with the printer and got error 231 (05/08) and couldnt print. Got replacement toner catridges - but had same problem. In the end Cartidge save sent me two oki originals - which worked just fine. however had two delivery/install failures on same colours (black and cyan) with comptaible cartridges. Which suggests that the compatability/re chipping is having some issues. cartidge save through out however have been very helpful and quick to respond. I'm now back prining on the 3rd attempt with orignal tonar cartridges fitted instead. Thanks for getting back online and printing. service was excellent not withstanding the issues not reading the compatible toners sent