Small: 8oz Medium: 24oz Pon is the perfect alternative in places where conventional soil cannot or should not be used. Pon is a perfect fit for all plants (even orchids and citrus plants). Pon consists of high-quality, mineral stones that are free from contamination and pollutants. Pon has an ideal air / water ratio for plants (45% water/55% air). It also reduces a plant's vulnerability to diseases. Even after years, this structurally-stable plant substrate does not condense and keeps its air-permeable structure. LECHUZA-PON can be used for years without needing to be replaced!