4013 - Inner tubes, of rubber:

This HTS category, 4013, encompasses all inner tubes manufactured from rubber. These are the inflatable chambers used within tires to hold air pressure, essential for a wide array of pneumatic tire applications. The primary material used in their construction, rubber, is the defining characteristic for classification within this heading.

Unlike its siblings, which fall under entirely different sections and chapters of the HTS relating to live animals or other varied commodities, heading 4013 is specifically dedicated to articles of rubber. Within Chapter 40, it differentiates itself from finished tires (heading 4011) or other rubber articles by its focus solely on the inner tube component.

The subcategories within 4013 provide further specificity based on the intended use of the inner tube. Heading 4013.10.00 distinguishes tubes for motor vehicles such as cars, buses, and trucks, while 4013.20.00.00 specifically covers those designed for bicycles. The residual category, 4013.90, serves to classify all other rubber inner tubes not covered by these more specific end-use classifications.