Perman Aquarium Magnetic Brush Fish Tank Glass Algae Scraper Cleaner Floating Curve Material: Plastic and high magnet material. Color: White and Blue. S Size: Approx 7cm X 3.5cm X 6.5cm. M Size: Approx 9.5cm X 4.1cm X 7.1cm. Magnetic force available between less than 6mm. Brand new and high quality. Suitable for use with varying glass thickness. The streamline design is so artistic and pleasing to the eye. Floating design avoids lost magnets on the bottom of your aquarium and makes it convenient for use. Non slip griped handle for improved cleaning action. Super strong magnets for use with varying glass thicknesses. Non slip griped handle improves the cleaning action, while anti-scratch cleaning pads are highly efficient in removing algae from glass.