1.Both Faces Natural
Standard Thickness(mm)10-20m 15-25mm 20-30mm
Standard Dimension (cm)30x15 30x30 40x40 20x40 30x60
2.One Face Natural & One FaceCalliberated
Standard Thickness(mm) 10mm or 15mm
Standard Dimension (cm) 30x30 30x60 40x40
3.One Face Calliberated & One FaceHoned