We make the highest quality aquarium cleaning magnets for use on glass and acrylic aquariums from 10 to 1,000 gallons or with thickness of 1/8 to 1-1/2.Our cleaning magnets are made with Neodymium Rare Earth Magnets, one of the strongest magnets. In the world! We dont use surplus magnets -- only new. All of our cleaners are made of the finest, safest and most cost-effective materials available. A fun and easy way to remove algae from your aquarium with no messy cleanup after cleaning -- imagine that! Each of our cleaners has the following qualities: Strong, high-quality neodymium rare earth magnets, Replaceable inner scrubbing pad with nontoxic adhesive backing, Replaceable felt pads for the outer cleaning assembly, Inner assembly is non-toxic and can be left inside tank all the time-- it will not rust!, Can be used on all glass aquariums, Acrylic-safe inner scrubbing pads make it ultra safe to use on acrylic aquariums, Can be used in fresh and salt water, Decorative finish that becomes part of your aquarium, Limited 2-year warranty on material and production defects, 30-day money back guarantee.