Coffee in Kenya is graded based on the size, shape, weight, and overall quality of the beans. The grading scale from largest to smallest is AA, AB, PB, C, E, TT, and T. Here are some details about the grades: AA: Beans with a screen size of 17 or 18 (17-18/64 of an inch). AA beans are the largest and produce more oils that give coffee its aroma and flavor. E: Also known as Elephant grade coffee beans, these are the largest Kenyan coffee beans. They come from coffee cherries where two coffee seeds are joined in one cherry. The large size of these beans gives the coffee a rich, full-bodied cup. C: Screens 14 and 15. AB: Screens 15 and 16 (6.6 mm). Kenyan coffee is known for its bright acidity, rich body, and distinctive flavor. Some popular varieties include K7, Blue Mountain, Batian, Ruiru 11, and the SL series.