1ink.com’s cartridges come with a full one-year warranty. If you receive any defective product, they will exchange that product for a brand-new cartridge within one year (365 days) of your original date of purchase. Should you request a refund in lieu of an exchange, you can send that product back to 1ink.com for a refund within one year (365 days) of the original date of purchase. However, you need to contact them before returning any product so that they can issue a Return Merchandise Authorization Number.