Made of high quality stainless steel material, anti rust and no breakage, solid and durable to use. Perfect tool for removing slime and algae build-up inside most filter impeller wells. With a hook on the top of brush, easy and convenient to hang on the wall or somewhere. Two different sizes and very flexible for easily cleaning any narrow places of filter. Also suitable for cleaning test tubes, bottles, gun barrels, jewelry and all kinds of hard to get to objects.