SPF Spruce Pine Fir This SPF Spruce Pine Fir is known for good staining, working, planing and shaping properties. Our professionals use advanced tools and techniques to design this product in the desired shapes, sizes, finishes, textures, and designs as per clients requirements. The offered product is used to make a soundboard of guitars, violins, cellos, pianos, and mandolins. This product is utilized to manufacture and design wall studs, roof rafters, and floors. Also, it is used for manufacture home buildings and panels.