Rubber Horse Stall Mats, Equine Rubber Mats, Horse Trailer Mats 4' x 6' x 3/4" (1) Black Rubber Mat - 4' x 6' x 3/4" 15 year limited warranty against manufacturer defects in material and workmanship. Color: "Natural" rubber is primarily black but will include a small amount of multi-color flecks. Often this is better than plain black as it helps in camouflaging dust and dirt.