General Hydroponics CocoTek Brick<div style="text-align: left;"><strong>[Product Information]</strong><br><ul><li>Natural coconut for increased water capacity</li><li>Compressed brick will expand to 2.5 gallons</li><li>Provides excellent water retention</li><li>Creates an ideal growing environment and improves aeration</li></ul></div><img src="http://ecx.images-amazon.com/images/I/415JbnJVjiL.jpg" noproxy>