There are firearms and ammunition, controlled equipment, explosives, compressed and liquefied gases and their containers, etc.

Specific include:

1. Pistols, rifles, submachine guns, riot guns, and air guns.

2. Compressed oxygen, nitrogen, and helium.

3. Metal sodium, potassium, lithium, zinc powder, magnesium powder, calcium carbide.

4. Permanganate, perchlorate, hydrogen oxide, sodium peroxide, potassium peroxide, lead peroxide, etc.

Items with limited number of items to be sent by express delivery:

1. Each item of cigarettes and cigars is limited to two (400 pieces) (when the two are sent together, the limit is two).

2. Each piece of tobacco leaves and cut tobacco sent by mail is limited to 5 kilograms (the combined mail of the two cannot exceed 10 kilograms).

3. When users mail tobacco and its products, each person is limited to sending one item at a time, and multiple items are not allowed.

Reference for the above content: Regulations on the Management of Prohibited Items_Baidu Encyclopedia