The Mag-Float Glass， Acrylic & Plastic Floating Magnetic Aquarium Cleaner lets you remove algae from glass， plastic or acrylic aquariums without getting your hands wet. 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. That means you can stay dry while you clean， and you won’t have to worry about knocking over decorations or damaging corals or invertebrates. If the two magnets separate， the inner piece will float for easy retrieval. The plastic cover keeps the magnets rust-free， so you can leave them attached to the tank for practical storage.

HAZARDS TO HUMANS: Do not place magnets together outside of the aquarium after its initial use， unless magnets are completely dry. For longer durability， maintain the felt on the magnet's dry side (logo side that is placed on the exterior aquarium surface). This portion of the magnet does not float. Keep away from children and electronic devices such as computers or pace makers. Strong magnet. Watch your fingers.