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.

Specification:
Size:

7cmx3.7cmx6.8cm (Small Size)
9.5cmx4.3cmx7.2cm (Medium Size)
10.5cmx5.5cmx7.5cm (Large Size)

Material: plastic+magnet
Color: as picture

Small size brush suitable for aquarium 30~50cm with thickness less than 5mm.

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.

1pcs Aquarium Fish Tank Magnetic Brush