Imageking LaserJet (6 Pc paked Black Ink Powder) Quality Control As Internal Components Are Undisturbed, Both New And Re Manufactured 88a/35a/36a Toner Cartridges Are Simply Refillable Several Times Before Components Become Worn And The Quality Deteriorates. At This Stage You Decide For Yourself That It Is Time To Start A New Cartridge. You May Reclaim Any Unused Toner And Use It For Your Next Refill. Suitable For Use With The Following Printers: Hp Laserjet P1007 Printer (Cc365a) Hp Laserjet P1008 Printer (Cc366a) Hp Cb435a Hp Cb436a