The answer is none. Technically, Granular B (Type II) is a manufactured product, such as crushed granite that passes through a 4” screen. We manufacture our Granular B Type II with 100% granite as a 2” minus product. Some contractors manufacture as a 3” minus product. The 3” minus will perform the same but is more difficult to grade and the driving surface is not as desirable as a 2” minus.