Marineland Magnum Internal Polishing Filter Floss SleeveMarineland Magnum Floss Sleeves for the Magnum Internal Canister Filter feature a fine mesh weave which traps suspended particles while promoting water flow. This water polishing media prevents premature clogging and helps prolong filter media life. Fine mesh traps and holds dirt particles Open cell construction promotes water flow Prevents premature clogging and prolongs filter media life Fits Marineland Magnum Polishing Internal Canister Filters.