The Sunleaves® Classic Coir Brick is a compressed coconut-fiber growing medium that expands to approximately one-third cubic foot when soaked in water. This renewable resource retains air and moisture extremely well. Classic Coir is the original finely-shredded medium that growers have come know and love and is a preferred choice among African violet enthusiasts. It's great for amending soil and soilless mixtures. Expanded contents will fill a little over three 1-gallon nursery pots.