Solder or pewter is an ALLOY, a combination of two or more metals, that is commonly used in the manufacturing of jewelry and other decorative items. It is composed of tin and lead, and sometimes copper, antimony, bismuth, and silver. The ALLOY is malleable and can be easily molded into various shapes. It is also resistant to corrosion and tarnishing, making it a popular choice for jewelry and other decorative items.