1) Top Quality 2) Big and stable quantity are available; 3) Competitive Price; 4) Quick delivery; Name: Black SlateSpecification: A) Size: 1)305x305 mm or 12"x12"; 2)400x400 mm or 16"x16"3)457x457 mm or 18"x18"; 3)300x600 mm or 12"x24"; 4)600x600 mm or 24"x24"; B) Thickness: 10mm or 3/8", 12mm or 1/2", 15mm, 18mm, 20mm, 30mm etc Black Slate-Culture Stones