The Single Pebble unit is perfect for children between the ages of 2 and 12 years old. The pebble unit comes in 12 inches high, 18 inches high, or 24 inches high, and it has a fall height of one foot. Its safety zone is dependent on the layout. You have the choice between the colors of tan, green, yellow, or blue for the pebble tops to come in. The tan and green pebble tops come with brown posts, and the yellow and blue pebble tops come with red posts. The Single Pebble unit is perfect for children’s independent play!