Features:
The brush has strong magnetic force and can maintain for 10 years.
Move the magnet outside, the inside magnet brush follows to clean the glass. Won't dirty and wet your hands.
The floating inside brush won't sink in the fish tank.
Clean algae and scum off of the inside of your aquarium the easy. Easy to clean the corners.
Suitable for aquarium less than 8mm thick.

Specification:
Size: approx. 4cmx4cmx5cm (Dia. 4cm, height 5cm)
Material: plastic+magnet
Color: purple, orange, white and green for  your choice.

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 Mini Small Aquarium Fish Tank Magnetic Cleaning Brush