Notrax 340 Soil Guard Natural/Styrene-Butadiene Rubber Entrance Mat, For Outdoor Area, 3' Width x 5' Length x 1/4" Thickness, Black Heavy-duty, durable rubber matting designed with low profiles for door clearance / cart traffic Raised bar design scrapes debris from shoe traffic Easy to clean  simply hose off Overall thickness is 1/4 inch to minimize tripping hazard Recommended and approved product as a part of the GreenTRAX program for "Green Cleaning" environments (when used as part of the "Stages" system)