Feature: 1. Double Blade: Magnetic algae scraper has a double headed scraper, durable, a scraper that clean, comprehensive cleaning, saving more effort. 2. 4X Powerful Magnet: Fish tank magnetic brush is designed with hollow inner brush, the brush is suspended and does not sink, and the 4X powerful magnet does not demagnetize for ten years. 3. Double Sided: Fish tank magnetic brush has durable inner bristles that won't deform, easy to remove algae, and soft outer bristles that won't hurt the tank wall. 4. Ergonomic Handle: Fish tank magnetic brush with ergonomic hand grip shape, frosted texture, non slip design. 5. Cautions: Aquarium glass cleaner magnetic powerful, please do not force break open cause accidental injury, separate magnetic brush need to twist 90 degree. Specification: Item Type: Magnetic Algae Scraper Material: Plastic, Neodymium Magnet Use: Magnetic Brush for Cleaning Fish Tank Suitable for Fish Tanks: within 40cm/15.7in Suitable Thickness of Cylinder Wall: ≤4mm/0.16in . Package List: 1 x Magnetic Algae Scraper 2 x Blade Note: 1. Keep pacemaker wearers away! 2. Do not use this product in acrylic, plastic, crystal and super white fish tank!3. Manual measurement, please allow slight error.