ONN? brand Ink Cartridges provide high quality and great savings and are an ENVIRONMENTALLY FRIENDLY replacement alternative as it is a once-used genuine original that has been refurbished to perform like new. The use of this product will NOT void your printer warranty. Each cartridge processed has been specifically filled and then tested so it works like the original in your printer. XL = MORE INK in the cartridge and MORE PAGES you can print. This cartridge works with: Canon PIXMA TS3520 TR4720. For support on your cartridge call 877-925-3700; or go online to www.cartridge-support.com.