10 oz US Flag Design 999 Fine Silver Bar Mint:Highland Mint Silver content:10 oz Purity: 999 Fine Silver Highland Mint is a well-known mint known for producing high-quality bars and rounds. Every Highland Mint coin or bar is distinctive in its own way. Add this beautiful silver bar variation to your collection right away! Each bar is made of.999 pure silver. Note: Bullion products may have minor production imperfections—this is normal and expected for investment-grade bullion.