A twin gear juicer is a special kind of masticating (chewing) juicer: it uses a dual gear mechanism to crush, mix, and press even more juice (especially from leafy greens) than you’d get from a single-gear masticating juicer. The most coveted of twin gear juicers is the Green Star Elite, which is not only high-yield and quick to clean, and comes with a 12-year warranty should you encounter any snafus along your juicing journey.