According to the PRS website "Korina, also known as Limba, is an African wood known for its legendary tonal qualities that add mids to the usually more mellow mahogany sound. The result is a very light guitar that is rich in tone."

I personally do not have much experience with the wood... IMHO it looks like bleached out Mahogany (in a good way). The grain is tight and makes the finishes really good.