This wooden staircase is a beautiful blend of both durability and style. The treads, handrail, and newel posts are all constructed from oak, which is known for its strength and resistance to wear and tear. The risers, which are the vertical boards that support the treads, are made from birch, which provides a subtle contrast to the oak while also being a strong and durable wood. The string, which is the board that connects the treads and risers, is made from red deal, a type of pine known for its durability and resistance to rot and decay. The combination of these different woods creates a staircase that is both functional and aesthetically pleasing. The oak treads, handrail and newel post will give a sense of warmth and elegance to the space, while the birch risers and red deal string will add a touch of rustic charm.