Give your biOrb an autumnal look with the biOrb Autumn Fern Set of 2. The artificial fern plants are supplied in packs of two containing one small and one medium plant with the tallest plant being 11.42 inches / 29 cm in height. Instead of a large plastic base these plants have a smooth weighted ball which is easier to fit into the ceramic media in the biOrb and holds it in place. They are suitable for 8 gallon / 30 liter biOrbs and larger.