White Oak (Quercus spp.); relative hardness - 1,360 (Janka); thickness: - 3/4", width - 6-1/2"; lengths- up to 71", finish - Wire-brushed w/PPG & aluminium oxide coating. 35-year limited residential warranty; installation - nail, staple or glue-down. Environmental - FloorScore certified & CARB Phase II compliant.