Paving stones define beauty, elegance and durability for driveways and walkways. A properly installed paving stone driveway won't crack, sag, shift or separate. It will keep looking fantastic for generations, and if it ever becomes stained or marred by paint or oil it can be repaired quickly, easily and invisibly. Individual stones can be replaced with matching ones so that the surface looks exactly as it did before the accident occurred. This is impossible with any other type of pavement. PRODUCT SPECIFICATIONS Sizes (mm): 300 x 300, 300 x 600, 400 x 400, 600 x 400, 600 x 600 Thickness: 10mm, 20mm, 30mm