VICTORSTAR @ Remanufactured Ink Cartridges Replacement For HP 21XL (1 Black C9351C)+ HP 22XL (1 Tri-Color C9352C) High Yield/HP Deskjet 3910 3920 3915 3918 3930 3938 3210 D1311 D1320 D1330 D1341 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