Canon PIXMA iP4600 / iP4700 / MP640 / MP620 / MP980 continuous ink system REFILL KIT compatible with Canon PIXMA iP4600 / iP4700 / MP640 / MP620 / MP980. This is a Uni-Kit refill kit to replenish the ink in our Uni-Kit 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 Uni-Kit 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-220 / PGI-520, CLI-221 / CLI-521 series. Remember, the ink in this refill kit is UV resistant and matches the OEM quality in both quality and page yield.