The NESCAFÉ® Dolce Gusto® machine heats water, which is passed at high pressure - a maximum of 15 bars - into the coffee cup through a capsule of high quality NESCAFÉ® roast and ground coffee. The coffee that is used in the capsules is made of premium 100% Arabica NESCAFÉ® varieties. The high pressure and the capsules are designed to deliver an even distribution of water and pressure over the coffee to ensure that flavour is maximised. This system uses pressure similar to that of professional machines. Whilst coffee percolators operate at one bar of pressure (normal atmospheric pressure) and a number of other machines operate at no more than two bars, the NESCAFÉ® Dolce Gusto® system can operate at 15 bars. Each capsule makes one cup of coffee in under a minute (some products need two capsules).