It's a flexible grow bag, holding a 500 gram block of dehydrated coconut substrate enriched with endomycorrhizae. The bag has small holes punched in its base to facilitate drainage and it has been treated to achieve excellent UV stability. With 1,8 litres of water, it yields up to 4 litres of high quality cocopeat. Suitable for indoor and outdoor use. Perfect for permanent and long-term crops.