Marineland Penguin Rite-Size Ready-To-Use Filter Cartridges

Ready-to-use filter cartridges for Penguin Power Filters. Pre-assembled cartridges are packed with Black Diamond Pure Activated Carbon--works twice as fast and keeps working long after other carbons quit.Double-thick polyfiber pad.Makes aquarium water sparkle.Traps more dirt.Removes more impurities.Delivers maximum water to carbon contact.