… mirrors and other optical elements, of any material, unmounted, other than such elements of glass not optically …
Explanatory notes
… mirrors and other optical elements, of any material, unmounted, other than such elements of glass not optically … with connectors) consist of a sheath containing one or more optical fibre bundles, the fibres of which are not … above, and also to elements which have been polished after moulding. The heading does not apply to unpolished elements …