An appealing, engaging sensory construction set, finished with a smooth, shiny, mirror effect. Designed to challenge, the children have to determine how to balance the boulders. Finished with a smooth, shiny, mirror effect. Great on their own but brilliant with the other Marvellous Metallics resources. Please note these are not suitable to be used in sand or water or to be soaked. Avoid using in direct sunlight as the mirrored surface will reflect the light. Not suitable to be left outdoors.