All rocks are created off natural stone boulders. Due to natural effects which include crevices, outcroppings and pretty much any natural irregular texture, our Fake Rock Camo rocks mimic the real rocks they were created off of. Careful attention needs to be taken in identifying what it is you are covering and what the size rock that works best will be. For example, a rock that measures 24 inches round and 12 inches tall does not necessarily mean the rock is exactly 24 inches round at the height of 12 inches. Fake Rock Camo is more than happy to provide you with their expertise in sizing your application with the proper rock size.