Floating magnet cleaner with removable and replaceable S/Steel scraper for Fresh or Saltwater glass aquariums. 2 in 1 magnet cleaner that scrubs away algae and scrapes away stubborn marine coralline algae. The original floating magnet cleaner design features easy retrieval when magnets become separated. Dimensions (L x W x H mm): 120 x 60 x 30mm (Excluding Scraper) Suits glass thickness up to: 20mm Note: Although the scraper is made from 316L stainless steel, it is recommended to remove the scraper from the aquarium after use and rinse under freshwater and dry off. 316L stainless steel has good anti corrosion properties but if left in the high Chloride ion (Cl-) and Bromide ion (Br-) environment of seawater it will eventually corrode. When storing your Mag-Float or Mag-Float Scrape use the supplied plastic spacer between the magnet halves.