outdoor stone: 1. surface: mushroom stone, natural surface 2. size: 100* 200, 200* 400, 300*600mm etc 3. 30-80mm outdoor stone: 1. surface: mushroom stone, natural surface.2. size: 100* 200, 200* 400, 300*600mm etc3. 30mm, 40mm, 50mm, 60mm, 80mm4. characteristic: low water absorption, non-weathering. 5. excellent acid and alkali durability. outdoor stone