Robuta

https://www.diggerslist.com/search?q=insoluble+dietary+fiber+market+size&page=171
insoluble dietary fibersearch formarket size
https://www.medlineplus.gov/ency/article/002136.htm
There are 2 different types of fiber -- soluble and insoluble. Both are important for health, digestion, and preventing diseases.
insoluble fibermedical encyclopediavsmedlineplus