Bradstone Natural Limestone Blue-Black 600x600 (40 Pack) Natural Limestone gives you the best of both worlds.  On the one hand, it offers outstanding visual appeal with its dramatic shades and distinctive natural veining.  On the other hand, Natural Limestone offers superb strenth and durability, this combines a uniquely striking appearance with a hardwearing performance, ensuring your patio looks great for years to come. Features - 40 paving slabs - 14.90m2 coverage. - Thickness 18 - 22mm