Double Blade: Magnetic algae scraper features a dual-sided design for efficient and thorough cleaning, helping to save effort. 4X Powerful Magnet: Fish tank magnetic brush includes a hollow inner brush that remains suspended without sinking; equipped with a 4X strong magnet that maintains magnetic strength for up to ten years. Double Sided: Durable inner bristles resist deformation and effectively remove algae, while soft outer bristles protect the aquarium walls from scratches. Ergonomic Handle: Designed with an ergonomic grip and frosted texture for a secure, non-slip hold during use. Cautions: This powerful aquarium glass cleaner should not be forcibly separated to avoid injury; the magnetic components should be twisted 90 degrees to detach. Package Includes: 1 x Magnetic Algae Scraper, 2 x Blades Item Type: Magnetic Algae Scraper Material: Plastic, Neodymium Magnet Use: Magnetic brush for cleaning fish tanks Suitable for Fish Tanks: up to 40 cm (15.7 in) Recommended Glass Thickness: ≤4 mm (0.16 in)