The Pebble is a great way for kids to develop basic coordination skills through balancing activity. Although sold individually, the Pebble is best suited when arranged in a group together. The Single Pebble is available in a variety of plastic colors (Blue, Green, Orange, Red, Tan, Yellow) and comes standard in matte black paint. The plastic step is 12.2" in diameter and 7.5" high. The design accommodates 18" in-ground for mounting, up to 12" for surfacing, with a finished step height of 18" or less. This allows you to place the Pebbles at varying heights and add to the overall challenge of the equipment.