GOTD Magnetic Aquarium Glass Cleaner - Aquatic Algae Cleaning Magnet Clean algae and scum off of the inside of your aquarium the easy, fun way! Strong magnetic forces cause the inside cleaning brush to follow the outside handle. Just wipe the outside, and the inside is cleaned! Size: Approx 7cm X 3.5cm X 6.5cm ( 2.8" X 1.4" X 2.6"). great for small to medium aquariums Material:Plastic and high magnet material