Notrax 136 Polynib Entrance Mat, for Lobbies and Indoor Entranceways, 4' Width x 6' Length x 1/4" Thickness, Charcoal - GID-851015 A very tightly nibbed loop that entraps debris and hides it for an always elegant appearance Vinyl backing in corresponding colors helps reduce mat movement Face Weight: 24 oz. per sq. yd. Overall thickness of 1/4" to perform in narrow clearance doorways Vinyl backing in corresponding colors helps reduce mat movement