Floor Tiles in the shale is rectangular / square slate. Standard width is 20, 30, 40 and 50cm in decreasing lengths, and minimum length is 10cm longer than the width. Produced in 30x30, 40x40, 30x60, 40x60cm. Supplied as standard in thicknesses of 1-2 and 2-3cm. We can be sorted in less thickness variation to a request. This is the slate of indoor and outdoor use. In the largely thickness of 1-2cm, the outdoors, we recommend a thickness of 2-3cm.