?Convenient to use? The non-slip handle improves the cleaning action, while the anti-scratch cleaning pads are very effective in removing algae from the glass. ?Unique design? Unique cleaning tool. Strong magnetic forces cause the inner cleaning brush to follow the outer handle. Just wipe the outside and the inside is clean. Good Cleaning Tool The magnetic algae scrubber is used to clean the aquarium, a very handy tool for cleaning windows. Make the glass shiny and see the fish clearly. ?Size Suitable size? Suitable for aquariums 40cm-1.5m, aquarium glass thickness 4-25mm. ?Strong Magnet? Super strong magnets sweep algae and scum off the glass. Super magnetic attraction, great cleaning power. Type: small Size (cm / inch): 7 * 3.8 * 5.7 / 2.8 * 1.5 * 2.2 Maximum thickness: 6 mm or less / 0.2 inch Aquarium length (cm / inch): 40cm or less / 15.7inch or less Package weight: approx. 100-262g Package List: 1 * aquarium cleaning brush