nano glass marble 1. perfect white color; 2. not fragile but newly marble characteric; 3. Nano technology; 4. Thickness: 12mm, 15mm, 18mm, 20mm, 25mm; 5. Size: 1200mmx2400mm, 1200mmx1800mm, 1800mmx2400mm; 6. Features: zero water absorption rate, high brightness, high density, no radiation rate;