Hearth Rugs in dense heat-set polypropylene (350,000 knots square meter) with deep 11 millimeter pile height, over 1/2" thick for better protection.   Length 47,"  Depth 24" (measured from front to back).   This is the same quality hearth rug we have provided to fireplace shops and stove shops for more than a decade.   Note disclaimer:  These rugs meet Federal requirements (FF1/2-70) for surface flammability of small carpets.   This rug is designed to resist ignition from small sparks or embers, but small embers or sparks can scar the surface of the rug.   This hearth rug is not designed to replace stove boards or other flooring protection required by local codes.    Do not use directly beneath a free-standing stove.