Fortune stones ltd, since 1996, manufactures various types of slates granite. Jk black is a part of those products. Both side of this granite is natural. Thickness in both side is natural and the length is about 10 to 15 mm [+ / - 2 mm]. Smaller strips in the length between 15 cm to 30 cm and width between 7.5cm to 28 cm and thickness between 15-20 mm are also available.
