Switzerland is the home to four of the world's top precious metals refineries - these include PAMP, Argor-Heareus, Valcambi and Metalor. Bullion bars produced for the Swiss banks, such as Credit Suisse and UBS, are also manufactured by the top Swiss precious metals refineries. All Swiss silver bars for sale have a minimum fineness of 999, and meet all standards set by the Swiss National Bank and the Swiss government for investment grade silver bullion. This standard is the highest in the world - as a result, Swiss silver bars are also recognised by the LBMA and by the COMEX. Silver bars manufactured in Switzerland normally are sold in 1 Kilogram denominations, with a 1 kg silver bar being the most popular size.