Four "Gold Panning Experience 20th Anniversary Commemorative Pouch Cards with Gold Dust" presented to me in March 2017 at Toi Gold Mine in Shizuoka Prefecture, during a gold panning experience. Each card contains two grains of gold dust. Dimensions: 5.5cm x 8cm I have stored these in a drawer in my desk at home for many years, but there are no noticeable scratches or stains. They will be packaged together in a plastic bag and shipped via Yu-Packet Post Mini.