Laser Tek Services &reg; 4 Pack Black Toner Refill Kit for HP C3906A 06A LaserJet 3100 3150 3150se 3150xi 5L 6L 6Lse 6Lxi Kit comes with 4 Bottles, Easy Instructions, Funnel Cap, and Latex Gloves if needed Each Bottle is good for at least the same page yield as a new cartridge, usually a bit more. Product is guaranteed to be same quality print, Bottle size may vary BUT gram load is always the same. Great phone support with Laser Tek Services, not usually needed, but if you need it we are there for you. Save big each time you refill and GO GREEN!!!