River Stone, 30" x 18", Onyx, Decorative Natural Stone Mat, Eco-Friendly 100% Natural Indonesian River Stones, Meticulously Hand Crafted Products Are Permanently Attached To A Strong Net Backing With Eco-Friendly Adhesives To Retain Shape & Last A Long Time, Poly Foam Backing Blocks Weeds & Sheds Water, Easy To Install, Extremely Durable, Use Indoor Or Outdoor.