PREMIUM QUALITY CONTINUOUS INK SUPPLY SYSTEM  100ml Pre-filled CIS system to suit Canon printer model: MX860 & MX870  (equivalent to approx 60 cartridges which would cost you £700.00*) Key Features: Premium grade US UV nano-micron filtered ink (0.1~2 um) UV absorber components for increased print fade life. Silicone tubing and ABS plastic ink reservoirs (UV block) Isobaric equilibrium structure (constant pressure) Silicone seal system (specific to Canon printers) ensures no air breach Model specific inks - profiled to appropriate model release. Equivalent to approximately 60 standard cartridges.  The 521 Canon cartridges have approximately 8mls of usable ink inside  although the cartridge is not actually empty when the chip sends the signal to the printer. Canon cartridges are around £10 each.  Our CISS is pre-filled with 100mls of each coloured ink (rihac Platinum Premium Ink), so in dollar terms that is approximately £700.00 worth of cartridges if bought separately.   IMPORTANT NOTE This product requires the use of the genuine cartridge chips from your Canon cartridges. Our instructions explain how to remove, and affix them to our CISS cartridges. Our manual also covers how to disable the the ink monitoring when the chip indicates empty. This product can also be purchased pre-chipped (we supply and attach the chips) at an extra £11.50 as per the option below. This product is not sanctioned or manufactured by Canon and users must be aware that the use of any third party cartridges and/or CISS systems may void your printer warranty.