Material: malleable cast iron Size:1.5lb(0.7kg), 3lb(1.5kg), 5lb(2.5kg), 7lb(3.2kg), 9lb(4kg),13lb(6kg),18lb(8kg),22lb(10kg),27lb(12kg),33lb(15kg) Surface:Galvanized More holding power per pound. The Folding Anchor is great for all small boats including dinghies, inflatables, canoes and PWC. The ability to quickly fold and unfold in seconds and stow in a very small compartment makes the Floding Anchor a good choice . Galvanized malleable cast iron. Individulally labeled.