The Mag-Float Scraper Blades Aquarium Cleaner lets you remove algae from glass aquariums without getting your hands wet. Mag-Float Scraper Blades attach to Mag-Float’s small and medium Glass Floating Magnetic Aquarium Cleaners to create the ultimate cleaning tool. The Mag-Float consists of two powerful magnet pieces that are covered in non-toxic plastic. The magnet that goes inside the tank has fuzzy fastener on one side, and the outside magnet has felt. As you move the outer magnet, the abrasive fuzzy fastener magnet follows and scrubs the tank as it moves along. If the two magnets separate, the inner piece will float for easy retrieval. With the Scraper Blade attachment, you’ll be able to scrape off tougher algae and reach the sides of the tank more easily. Key Benefits Scraper Blades attach to Mag-Float’s small and medium Glass Floating Magnetic Aquarium Cleaners (sold separately) to create the ultimate cleaning tool. Stay dry while you clean your aquarium. Two replacement blades included. For use in glass aquariums only! Remove stubborn algae and reach corners easily.