NoTrax 117 Heritage Rib Entrance Mat, for Lobbies and Indoor Entranceways, 4' Width x 6' Length x 3/8" Thickness, Charcoal A heavier-weight double rib high/low design that performs the scraping function of the mat (Note: ribs run length of mat) Vinyl backing helps reduce mat movement Face weight: 24 oz per square yard Backing thickness: 70 +/- 4 mils Weight: 0.85 lbs square/feet