The best substrate for your Earthworms, Nightcrawlers, & other Composting Worms. Made from 100% Organic Coconut Husk Coir. Premium substrate to keep your worms happy and healthy. This product is a 5kg compressed block of coconut coir. Just place in a large plastic bin, and rehydrate with water. Break up by hand after water has been absorbed, and mix well. Extra product may be stored for later use. Price includes shipping.