All Brother cartridges – including those in this LC1000VALBP Multipack – are rigorously tested to ensure they provide customers with the most consistently reliable solution possible. This value pack contains four high yield cartridges which last longer than a standard cartridge but offers the same excellent quality results.Though cheap, non-branded refill cartridges are widely available, they’re simply not as compatible with your Brother printer. They can cause issues with both printout quality and your machine’s performance – and these problems can sometimes prove costly to put right.These genuine LC1000 high yield replacement ink cartridges in Black, Cyan, Magenta and Yellow ensure your printer continues to run glitch-free, providing you with better value in the long-term plus the peace of mind that comes from knowing you have a printing setup you can depend on.