SOUTH DAKOTA Goldback 1 Note Aurum (20 Pack) - 24k Gold Bills Random*This package includes twenty (20) of the South Dakota Goldback 1 denomination bills. The South Dakota Goldback is made of a spendable, beautiful, physical gold. Through the use of cutting edge technology, gold atoms are evenly adhered to a strip of polyester, which is then covered with a thin, durable laminate. Unlike gold foil, a Goldback is made with precision and consistency, which is important when dealing with fractional amounts of gold.