Rand Refinery is one of the largest producers of precious metals in the world. Based in South Africa, they make themselves the seat of the highest quality and most durable precious metals in the world. Their products are consistently among the most sought after precious metals in the market and this silver bar is no exception. Many things make this silver bar one of the favorites among those that invest in precious metals and collect these metals for investment purposes. The 1 troy ounce silver metal has a thickness of 2.6 mm and a dimension of 481 by 28.9 mm. Because of the high purity level of the silver bar, the market value of this bar is quite high.