Seachoice Magnesium Diver's Anodes are suitable for fresh water only. They are high-quality, cadmium-free anodes that offer better protection than zinc while being 2.5 times lighter and less prone to corrosion. They are ideal for aluminum hulls. Seachoice is committed to delivering quality marine accessories and OEM replacement parts to satisfy fishing, boating and watersports enthusiasts worldwide. Seachoice is run for and by boaters, offering a wide-ranging product line while remaining affordable.