Red Oak (Quercus rubra), relative hardness – 1,290, thickness: – 3/4″ (Solid or Engineered Expert) or 7/16″ (Engineered NextStep), widths: 3-1/4″ or 4-1/4″ (Solid), 4-1/8″ (Engineered Expert), 5-3/16″ (Engineered Expert or NextStep), texture – Wire Brushed, finish – Titanium w/Pure Genius, Matte Lustre, 30-Year Residential Warranty. Installation – Nailed, Stapled, Glued or Floated (engineered only).