The original floating magnet cleaner suitable for Fresh or Saltwater glass aquariums. Easily cleans away nuisance algae without getting your hands wet. Powerful neodymium magnets create a strong magnetic coupling between the two halves. If the magnets become separated the cleaning magnet floats to the surface for easy retrieval. Dimensions overall (L x W x H mm): 89 x 35 x 24.5mm Suits GLASS thickness up to: 10mm Note: When storing your Mag-Float or Mag-Float Scrape place the supplied plastic spacer between the magnet halves.