New packaging and several sizes : M: 9.5 x 4.5 x 7.3 cm, suitable for 50-80 cm fish tank and fish tank thickness < 8mm Floating design : Due to the strong magnetic attraction, as you move the external magnet, the inner magnet follows, so cleans the glass. The internal floating prevents the brush from flowing into the bottom of the aquarium and makes it convenient to remove it from the tank. Multi-functions : Non-slip soft handle to make your hand comfortable and improve your cleaning action, while the anti-scratch pads are very effective in removing algae from the glass. Labor saving and time-saving. Apply 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 do not use it on the acrylic glass fish tank.