All Algae Free magnets are made with Neodymium Rare Earth Magnets, one of the strongest magnets in the world!
The Hammerhead Float has a cleaning area of 4" x 2" and will turn big cleaning jobs into fast, easy fun. Its floating inner assembly will float to the surface if disengaged for easy retrieval.
US Patent 6,634,052 and US Patent 6,348,104
This cleaning magnet is for use on glass and acrylic aquariums 1/2" - 5/8" (12 - 16 mm) thick.