The Mountain Oak series is hand sculpted, engineered from Elm and Birch. Elm is a beautiful wood with strikingly dynamic grain and knots and rich textures. Birch is typically straight-grained with uniform texture. 4 colors are available for each species. Elm comes in 14mm overall thickness with a 3mm rotary cut wear layer, 5'' (125mm) wide by 4' long. Birch comes in 3/8'' (10mm) overall thickness with a 3mm rotary cut wear layer, 5'' (125mm) wide by 4' long. You will have a distinctly beautiful and affordable floor that will surely catch the eye of any visitor to your home.