Create the Perfect Environment for your Fish and Plants * Premium Quality Virgin Polethylene that is Not Recycled. Beware of others offering recycled material which can be TOXIC! We only sell Brand New Media that has never been used before. * SIZE 10mm x 7mm (.39in x .28in) each piece. 1 Cubic Foot. Supports about 17 pounds of fish. This K1 is extremely efficient. * EXCELLENT FOR AQUAPONICS, AQUACULTURE, HYDROPONICS. Many commercial operations insist on our products for their very high quality and our knowledgeable & honest approach. * 100% MONEY BACK GUARANTEE ensures this will quickly become your favorite no-risk purchase.