You asked for it, you got it! Captain Saltys new magnets have been redesigned to eliminate rusting. We have encapsulated them with acrylic all around and encased them into a hard shell. This not only prevents rust because the corrosive salt water cannot dissolve the thicker acrylic but it also looks better and is easier to maneuver the magnets around the aquarium. However, because the nature of magnets these will be sold in pairs to ensure that they will attract to each other instead of repelling.