9902.17.54 - Clear or frosted columnar globes or shades, certified by the importer as of extruded borosilicate glass; the foregoing measuring 2.54 cm or more but not over 30.48 cm in length and 2.54 cm or more but not over 20.32 cm in diameter, each with circular openings at the top and bottom, designed for use on portable non-electrical lanterns for outdoor use (provided for in subheading 9405.91.40)

This classification, HTS Code 9902.17.54, pertains to specific components for portable non-electrical lanterns. It covers clear or frosted columnar globes or shades manufactured from extruded borosilicate glass. Key physical characteristics for classification include dimensions: a length between 2.54 cm and 30.48 cm, and a diameter between 2.54 cm and 20.32 cm. Furthermore, these globes must feature circular openings at both the top and bottom to be eligible under this provision. The explicit certification by the importer that the goods are of extruded borosilicate glass is a critical requirement.

As a temporary legislation provision within Chapter 99, this HTS code serves a specialized purpose, likely related to temporary trade policies or import restrictions, and therefore, it does not have direct substantive siblings within the main commodity chapters of the HTS. Its function is distinct from the primary classification of finished goods or raw materials found in earlier chapters. Instead, its "siblings" are other temporary or special provisions within Chapter 99.

Since this is a leaf node, there are no further subcategories to introduce. The classification is highly specific, focusing on a precise set of articles intended for a particular application. The purpose of these globes, to be used on portable non-electrical lanterns for outdoor use, is a crucial functional criterion. The reference to subheading 9405.91.40 indicates the underlying substantive classification category for lamp shades and parts, but this 9902 code imposes additional, temporary requirements for classification.