Be Green Ink Eco Series Compliant Lexmark T640DTN Toner is the best option for your Lexmark T640DTN printer because you can count on exceptional quality at an affordable price. Be Green Ink Eco Series Compliant Lexmark T640DTN Toner 64015HA,64035HA Toner High Yield 5 Pack Savings is made in an ISO 9001/14001 certified manufacturing facility and is tested prior to packaging to ensure that the print quality is the same as the original brand. Be confident knowing that when you purchase a BGI Eco Series Compliant Lexmark T640DTN Toner you are getting a very high quality Compliant cartridge that will perform at the same level as an original cartridge, but at a fraction of the cost.