At a4toner we are specialists in hp toner cartridges and especially in HP LaserJet Pro P1606dn toner. Here you can buy the best quality original toner and compatible ce278a toner. Our compatible toner cartridges have the same quality, reliability, number of pages or intensity of the black color as the original HP 78A toner. Why pay more for an original toner if you can buy the same or better much cheaper?