Ceramic bearings classified under 6909195010 are those composed entirely or primarily of ceramic material and used in laboratory or technical applications where chemical inertness, electrical insulation, or extreme temperature resistance is the key functional requirement. Precision ball or roller bearings of steel or mixed materials — even those with ceramic rolling elements — may instead classify under Chapter 84 (heading 8482) as bearings. The essential character of the article and the material composition of its principal components determine which heading applies.

Ferrite core memories are small toroidal ceramic (ferrite) rings that were used as non-volatile magnetic storage elements in early computers and are still used in certain industrial control and aerospace systems for radiation-hardened memory. They receive a dedicated line (6909191000) because their electronic function and trade significance warranted a specific statistical breakout. Importers of modern ferrite components used in inductors or transformers should verify whether those articles classify here or under Chapter 85 as electronic components, since the end use and form factor differ from classic core memory arrays.