This marine plywood is a BS1088 rated Meranti throughout marine plywood. Meranti is a very strong and stable plywood used for mostly structural application in the boat, such as, transoms, stringers, decks, and bulkheads. Meranti is a sub species of Mahogany which has some natural rot resistance and is inherently strong. This Meranti is also commonly referred to as "Hydro-Core" in the marine industry.