9902.11.81 - Polyethylene micro-tubes, having an interior diameter of 0.01 mm and wall thickness of 0.05 mm (provided for in subheading 3917.32.00)

This HTS category, 9902.11.81, specifically covers polyethylene micro-tubes with a precise internal diameter of 0.01 mm and a wall thickness of 0.05 mm. These are specially designated items, often subject to temporary legislative provisions and potential modifications under trade agreements or specific agricultural adjustment acts. The critical physical dimensions are the defining characteristics for classification within this particular subheading.

Unlike the broad range of agricultural products and live animals found in Chapter 01 and its siblings, this category falls under Section XXII, "Special Classification Provisions." These provisions are distinct from the general classification of goods in Chapters 1-97 and are typically employed for items with unique tariff treatments, import restrictions, or temporary measures. The presence of the "99" code signifies its placement within this specialized section, separate from the core HTS nomenclature for general merchandise.

As a leaf node, HTS code 9902.11.81 does not have further subcategories. Its precise nature means that any deviation in the internal diameter or wall thickness, or a change in material from polyethylene, would likely result in classification under a different HTS code, potentially within the parenthetical reference of subheading 3917.32.00 or another provision altogether. The strict dimensional criteria are paramount for correct classification.