Some types of juicers are product specific, because they are designed to only squeeze certain types of juice. Citrus juicers only juice citrus fruits such as oranges, grapefruits and lemons. The juice is made by pressing half of the fruit down onto a cone that spins and reams the fruit. Centrifugal juicers are the most common type of juicer.
They feed chopped-up or whole produce through a chute into a spinning basket. The pulp collects against the basket walls through centrifugal force, and the juice passes through tiny holes in the basket walls. Masticating juicers allow for continuous juicing by cutting up the produce and discharging the pulp at one end of the juicer. Twin-gear juicers will provide the most nutrients; they work by crushing and pressing fruits and vegetables to extract the juice more effectively.