The S/M/L fish tank brush can be used to fish tanks with a glass thickness is less than 5/8/10 mm. Simply stick the two parts together through your aquarium's plexiglass. Care for your fish tank and provide your aquarium animals and plants with a clean environment. Features: [Easy to Use]As you move the outer brush, the inside one follows. Now you can sweep both the outer and the inner glass surface simultaneously. [Self-floating]The inner brush adopts a self-floating design, even if the brush falls off, it will not sink, and it will float on the water surface. [Magnetic Brush]The magnets inside the brush provide a super-b attraction force, allowing the fish tank brushes to be tightly attached to the glass surface. [Comfortable Handle]Comfortable large handle, comfortable grip, non-slip design, convenient and labor-saving. [Useful]By using this product, you don't need to dunk your whole arm into the tank. Say goodbye to awkward long-handled tools. Specifications: Item Size: S; M; L (Optional) Color: White Material: ABS Style: Practical Application: Fish Tank Package Size: 11.5*8*7cm/4.52*3.14*2.75inch(S);14.5*9*8.5cm/5.7*3.54*3.34inch(M);16.5*10.5*9.4cm/6.49*4.13*3.7inch(L) Package Weight: 125g/0.27lb(S);220g/0.48lb(M);300g/0.66lb(L) Package List: 1 * Fish Tank Magnetic Brush