["FAST CLEANING BRUSH: Strong magnetic aquarium cleaner helps you to scrape the dirt off the fish tank quickly and completely. Just drop the scraper side into the water and it wont get your hands wet. Note that the small size S is only available for 4 mm" FLOATING DESIGN: The internal floating design of magnetic aquarium brush avoids the brush sinking to the bottom of aquarium. Don’t worry to get your hands wet or disturb your fish tank creatures. It is convenient to take the algae scraper out of the tank ALGAE SCRAPER: Install a sharp blade as scraper in the head of the brush which easily removes stubborn marks even if around corners. The inside anti-scratch cleaning pads clean fast and efficiently without scratching the aquarium glass MULTI-PURPOSE USAGE: Aquarium glass cleaning brush can be used not only in the aquarium but also for cleaning windows glass doors and other glass. Notes: Our brush is not used for tanks made of acrylic or plastic material AVOID SCRATCH: This aquarium cleaning brush will not scratch the tank. But it may cause scratches if the blade gets defects or it picks up small pieces of sand or gravel pancaked between the sides during a flip. Clean the brush timely after use]