I copy paste since this is too difficult in English
Naval Brass is the classic marine, high strength and corrosion resistant alloy containing nominally 60% copper, .75% tin and 39.2% zinc.(When simple brass has app 30%) It is widely used in marine construction where a strong, corrosive resistant and hard material is required. It is suitable for both
salt and fresh water applications. Naval brass is used in marine applications such as propeller shafts, marine hardware, decorative fittings, shafting, propeller shafts and turn buckles.
In my poor Greek English...

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Naval brass takes some time longer to loose its brightness and that s the most important....