An organic potting medium made from natural coconut fibers- this medium is ideal for hydroponic and mixed media cultivation. Each Crop Circle disk expands to about five times its compressed size. Crop Circle disks are a shredded form of coco- as opposed to the coffee ground consistency of competitive products- which result in much higher air to water ratio- extremely important for healthy root development. Crop Circles are entirely organic and manufactured from renewable resources. Each disk fills a one gallon container. Dimension of compressed disk - 5" diameter x 1 1 1/2" thick. Sold in case quantities only