Canon PIXMA iP4850 / iP4950 continuous ink system REFILL KIT compatible with Canon PIXMA iP4850 / iP4950 This is a BISONTEC refill kit to replenish the ink in our BISONTEC Continuous Ink System. This refill kit is equivalent to 8-9 cartridges PER COLOR! That is a total of about 40-45 cartridge yields all in this 1 refill kit!If you had to buy each cartridge separately you could spend over $600 for original cartridge brands or over $300 for compatible cartridge brands. This BISONTEC refill kit is the perfect buy for high volume printers at less than $50 this represents over 90% savings compared to buying new OEM cartridges!. Compatible cartridges are - Canon PGI-225 / PGI-525 CLI-226 / CLI-526 series. Remember the ink in this refill kit is UV resistant and matches the OEM quality in both quality and page yield.