NextStone Castle Rock Panel Windsor Buff (4 Panels Per Box)(16.12 Sq. Ft. Per Box) Matching Accessories: Sandstone Ledger & Ledger Corner, Window and Door Trim: Buff Matching Corners: Castle Rock Outside Corner Windsor Buff, Sandstone Outside Corner: Buff 16.12 Square Feet Per Box Durable and Lightweight. Quality Polyurethane cast from real stone Certified Green, Easy to Install, Energy Savings with Increased R Value