2-1/4 inch select red oak flooring. Unfinished. Contains all the variations in coloration produced by the contrasting differences of heartwood and sapwood. Also included are minimal character marks, such as small knots, worm holes, and mineral streaks, as well as slightly open characters. The combination creates a floor where the light sapwood and dark heartwood are combined with small characters and other small color interruptions. Source: central Applachian mountains. Each box covers 19.5 sq ft. We recommend a 5% waste allowance, and an acclimation perdiod of no less than three days-the longer the better.