new packaging and several sizes: L: 10.5*5.5*7.4cm, suitable for 80-150cm fish tank and fish tank thickness 15mm; M: 9.5*4.5*7.4cm, suitable for 50-80cm fish tank and 12mm thickness fish tank; S: 7*3.7*7cm, suitable for about 50cm fish tank and 8mm fish tank thickness. Floating Design: Due to the strong magnetic attraction, as you move the outer magnet, the inner magnet follows, therefore cleaning the glass. The internal float avoids the brush sinking into the bottom of the aquarium and makes it convenient to take it out of the tank. Multi-functions: Anti-slippery soft grip to make your hand feel comfortable and improve your cleaning action, while anti-scratch pads are very effective in removing algae from glass. Labor-saving and time-saving. Special design: Our magnetic fish tank brush is composed of a wiping surface, an internal magnet, an external magnet and a non-slip handle. This streamline design is so artistic and pleasing to the eye. Apply of all types of fish tanks: If your aquarium is large or small; square or rectangular, our magnetic fish tank brush is your best choice. But please don't use it on the acrylic glass fish tank. Number of shipments: 1 pcs