The most traditional way of investing in gold is by buying bullion gold bars. In some countries, like Canada, Austria, Liechtenstein and Switzerland, these can easily be bought or sold at the major banks. Alternatively, there are bullion dealers that provide the same service. Bars are available in various sizes. For example, in Europe, Good Delivery bars are approximately . bars are also popular, although many other weights exist, such as the , , 10 g, 100 g, 1 kg, 1 Tael (50 g in China), and 1 Tola (11.3 g).