NextStone Stacked Stone Panel Volcanic Gray (5 Panels Per Box)(18.15 Sq.Ft. Per Box) Matching Accessories: Sandstone Ledger & Ledger Corners, Window and Door Trim: Gray Matching Corners: Stacked Stone Outside Corner Volcanic Gray; Sandstone Outside Corner Gray 18.15 Square Feet Per Box Durable and Lightweight. Quality Polyurethane cast from real stone Certified Green, Easy to Install, Energy Savings with Increased R Value