Notrax 345 Rubber Brush Styrene-Butadiene Rubber Entrance Mat, For Construction Traffic Area and Municipal Buildings, 28" Width x 46" Length x 5/8" Thickness, Black SBR rubber remains flexible while withstanding extreme cold Thousands of flexible rubber fingers sweep shoes clean Suction cups on underside help to minimize mat movement Molded beveled edging on all 4 sides creates a retention dam to trap moisture Recommended and approved product as a part of the GreenTRAX program for "Green Cleaning" environments (when used as part of the "Stages" system)