Features:
The new aquarium fish tank magnet has strong magnetic force.
As you move the outside magnet, the inside magnet brush follows to clean the glass.The floating inside brush won't sink in the fish tank.
Clean algae and scum off of the inside of your aquarium the easy.

White and Black Magnetic Brush Specification:
Size: Suitable for aquarium 30~50cm with thickness ≤4mm.
Material: plastic+magnet
Color: white, black
Carbon fiber blade size:3.5cmx2.2cm

Note: 
Carbon fiber blades are only used for magnetic brush replacement blades, made of carbon fiber, not metal.

Note:
Please allow 1cm differs due to manual measurement.
Due to the different display and different light, the picture maybe a little different with the actual color of the item. Thanks for your understanding.
Please keep the product away from children and pacemaker wearer.