Stone Edge Surfaces Random Stone vertical decorative concrete stamp set for Stamped Concrete, Decorative Concrete, Concrete Overlay. The Random Stone Decorative Concrete stamp set comes as a set of 3 stamps. The stamps are designed almost as a star pattern so they can fit randomly against any of the sides of any of the 3 stamps. This gives an almost unlimited look and completely random pattern to the stones. Each stamp has two handles for application control. Each stamp is approximately 20″ x 20″ in size and are meant to be rotated in all directions for an unlimited pattern and random look.