VICTORSTAR Remanufactured Ink Cartridges With Visible Ink Level For HP 63XL (1 Black F6U64AN+ 1 Tri-Color F6U63AN) High YieldFor DeskJet 1110 1112 2130 3630 3632 ENVY 4520 OfficeJet 3830 4650 All empty cartridges are bought from the professional recycling dealers, each empty cartridge will be tested before stroage to assure the quality Use the advanced cleaning equipments with ion-free water to clean the empties to assure all products with same high quality Use the automatic vacuum injectors to assure the quality stable, each product should be tested on printers Ink volume is equal or more than the original volume, ink is done several strict testing and experiment before use Qualified products should pass the environmental test, they can be shipped by air, land or sea with leafless