niceEshop(TM) Magnetic Aquarium Glass Cleaner Floating Brush Comprehensive clean anywhere inside. As you move the outer magnet, the inside magnet follows, hence cleans inside glass Strongest absorb ability and powerful magnetic attraction, suitable for varying glass thicknesses Easy for Floating. The inside brush will not sink into the deepest of fish tank as it is floating. Humanized & Fashionable design. The streamline design is so creative, conform to human mechanics, easy to use. Smart Size : 4.9'' x 2.4'' x 3.5'' suitable for hand and use.