Our small mix is made of clean sterilized Rexius brand douglas fir bark which has been presoaked for 24 hours and then blended with charcoal and sponge rock. This is ideal for seedlings to moisture loving orchids. If the mix is not used within 3 weeks of arrival pour into a box and let it dry out. Re-soak before using again. Approx. FedEx Ground shipping charge on 1 hobby bag: $10-12, 1 large 1.25 cu ft bag: $15-20, depending on region.