4 in. x 10 in. x 8 ft. Prime S4S Fir Lumber4x10 Prime S4S Fir Lumber Crafted from prime, untreated fir, this 4" x 10" x 8' S4S lumber offers a smooth texture and versatility for any building project. It's easy to cut, paint, or stain, making it an excellent eco friendly choice for professionals and DIY enthusiasts alike. Key Features: Material: Made from high quality fir, a renewable resource from managed forests Versatility: Suited for painting or staining to match any design aesthetic