Assertion: tin bronze | /r/MadeOf | modest amounts of lead
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text: The tin bronzes rely mostly on tin for their strength; leaded tin bronzes additionally contain modest amounts of lead for better antifrictional properties, but at the expense of some strength; highleaded tin bronzes have the highest lubricity but the lowest strength, aluminum bronzes and manganese bronze serve applications which require their extremely high strength and excellent corrosion resistance.