Nunn Design Pewter Findings are cast in the United States of America using the pewter alloy NL7. This alloy’s constituents consist of 95.75% Tin, 2% Antimony, .25% Copper and 2.00% Bismuth. The higher percentage of tin has always been the hallmark to indicate the higher quality pewter alloys. There is 0% nickel content within the Nunn Design pewter castings.Nunn Design Findings are electroplated in the USA using precious metals; copper, 24k gold and .999 fine silver. The process of plating is very involved and requires many painstaking steps. These steps add to the quality that Nunn Design is known for. To learn more about our plating process, visit our FAQ section.Metal Stamping blanks are plated for metal stamping and engraving. We do not plate any of the Nunn Design Metal Stamping Blanks in the sterling silver plate. The sterling silver plate will crack and distort.