Sunleaves Expanding Coir Brick is a convenient, compressed coconut-fiber growing medium that expands to 1/3 cubic foot once soaked in water. Coconut fiber is a renewable resource alternative to other growth mediums and provides a sterile, moisture and air retaining environment for plants. The Coir Brick can be used as a replacement for soil, in addition to soil, in gardens and in hydroponic growing. Offer your customers this versatile, environmentally-friendly choice that comes neatly packaged with instructions