Precious metal "precious" metal can also be determined by high demand or market value. Precious metals in bulk form are known as bullion and are traded on commodity markets. Bullion metals may be cast into ingots or minted into coins. The defining attribute of bullion is that it is valued by its mass and purity rather than by a face value as money. The level of purity varies from issue to issue. "Three nines" (99.9%) purity is common. The purest mass-produced bullion coins are in the Canadian Gold Maple Leaf series, which go up to 99.999% purity. A 100% pure bullion is
United States Commodity Funds commodity ETP in the United States that invested in Brent crude oil (ticker:BNO), although previously a Brent crude oil based commodity ETP had been launched in London. In 2010, USCF launched its first non-energy specific commodity ETP, United States Commodity Index Fund (ticker:USCI), which holds a diversified basket of commodity futures based on the SummerHaven Dynamic Commodity Index ("SDCI"). The SDCI is the first broadly diversified commodity index whose commodity weightings are not fixed, but which instead are adjusted to reflect market conditions. USCF's commodity exchange traded products are all listed on the New York Stock Exchange. Prior to the