3919.10 - In rolls of a width not exceeding 20 cm:

This HTS category, 3919.10, encompasses self-adhesive plates, sheets, film, foil, tape, strip, and other flat shapes made from plastics, specifically when presented in rolls with a width not exceeding 20 centimeters. This includes a wide variety of plastic adhesive products, such as specialized tapes for industrial applications, decorative adhesive films, and protective sheeting, provided they meet the dimensional criteria for width.

It is important to distinguish this category from its sibling, 3919.90, which covers similar self-adhesive plastic articles that are *not* presented in rolls of a width not exceeding 20 cm. This distinction is primarily based on the presentation format and dimensions, with 3919.10 focusing on narrower rolls.

Within 3919.10, further subdivisions exist to refine classification based on material composition and specific surface characteristics. Subcategory 3919.10.10 addresses products with a light-reflecting surface, typically achieved through the incorporation of glass grains (ballotini). All other self-adhesive plastic articles in narrow rolls that do not fit the description in 3919.10.10 fall under subcategory 3919.10.20.