Karl Aiken Compatible Ink Cartridge Replacement for HP C9381a ( 2-Pack ) 1.shipping usually takes for 5-13 days, not need a month. 2.1 pk black/yellow, 1 pk cyan/magenta Not made by HP 3.Compatible Model: HP Officejet Pro K550dtwn / K5A400dtn / L7780 / L768A0 / L7580 / K5300 4. We stand behind every product we sell and offer a 100% satisfaction guarantee . Defective cartridge can be exchanged or refund within 90 days. 5.It is a good replacement for your original ink cartridges ,let you to save money