1. Industrial and Commercial Bank of China: There are three kinds of gold bars sold by this bank: 50g, 100g and 500g, of which 100g is the most popular. In addition, the bank also has 1g, 2g and 5g gold bars and 5kg and 1kg gold bars.

2. Agricultural Bank of China: The gold bars sold by this bank are 1g, 5g, 10g, 30g, 50g, 10g, 200g, 500g, 1kg respectively, of which 50g and 10g are the best. The bank also has precious metal gold bars and silver investment varieties.

3. China Construction Bank: The main gold bars sold by this bank are 50g, 100g and 1kg, of which 100g accounts for the largest proportion. In addition, banks also have large gold bars and pocket gold in kilograms.

4. Bank of China: The gold bars sold by this bank are mainly 50g and 100g, and 2g, 5g and 10g are also sold. In addition, the bank also has 500 grams and 1 kg gold bars for customers to choose from.