These counter-top hard-fruit juicers typically have spinning blades that spin against a mesh filter, separating the juice from its body. The juicer will then separate the juice and the pulp into two containers. Counter-top hard-fruit juicers are very quick at juicing your ingredients but with that comes a fair amount of noise.
The main difference between centrifugal and masticating juicers is the primary method by which they break down the food you place inside them to extract the juice. Centrifugal juicers have one blade which rotates at a high speed to slice and dice food, allowing the juices to flow free. In essence, it works a lot like a blender.
Masticating juicers make use of gears instead of blades and grind food instead of slicing it. Some masticating juicers have only one gear and simply grind food against nearby hard surfaces, while others grind food between two gears much like a meat grinder.