Umiwe Handle Design Magnetic Aquarium Cleaner Algae Scrapers Fish Tank Glass Scrubber Material: ABS + PVC plastic + magnet Size:12 x 7.5 x 9 cm/4.7 x 3.0 x 3.5 inch, suitable for tank under 18mm thick Humanized handle design can save your strength when cleaning the aquarium The strong magnetic force can clean inside by wiping the outside brush without get wet your hand Double-duty: wipe the surface of the fish tank without the detachable blade and weed out algaes with blade