The Shark Cage for Maelstrom Original delivers massive amounts of water to your tank. The single skin Shark Cage uses super-fine filtration to block leaves and debris, keeping your water clean. The Shark Cage Filter is the step up from the Maelstrom Original's plastic filter- it's incredibly easy to clean and handles higher flow rates of water - which means more water in your tank. Installation is as simple as lifting out the plastic filter and dropping in the new Shark Cage. Material: Stainless Steel.