blue stone window sills
can be different sizes and forms.
Normal size: width 20cm, 25cm, 30cm, length 100cm, 120cm, 140cm, 160cm, 180cm
thickness can be 2cm, 3cm, 4cm, 5cm, 6cm etc. popular thickness is 4cm, 5cm
honed surface process, can be tumbled, flamed, hammered etc
also can with water-drop line in the bottom.
