This is super fun. Simply soak your cactus in a cup or bowl of water and watch it grow. It will reduce back to its original size when it is out of the water. Beautiful as a display or simply watch it grow and grow! The cactus before soaking in water measures 28 x 28 x 20 mm Each pack Includes 4 pieces of the Growing Cactus. Random colours and designs will be issued. Age appropriate for 7 years old and up.