Why do Roland's premium piano keyboards include both wood and molded material? The wooden piano keyboards often found on acoustic pianos are attractive to look at, and they feel solid and substantial under your fingers. But a completely wooden keyboard is not the best approach for a digital piano, as wooden keys need regular maintenance to keep them in the best condition. Our premium HP and LX pianos use a new type of keyboard named PHA-50 that blends wood and molded material for the best of bot