According to the application information and the product information provided, these are so-called "end caps" (closing elements) made of polycarbonate, a plastic in the sense of Note 1 to Chapter 39 in different versions. The rectangular caps, approximately 7.8 x 9.0 mm in size (item no. 9859301 or item no. 9859201) each have different shoulders and guide bars, with one version also featuring a central through-hole. The rectangular products measuring around 17.2 x 13.0 mm (item no. 9859001 or item no. 9858901) each have a rounded long side and are characterized by different shoulders and guide bars. One of these versions is additionally provided with a central through hole. The end caps are attached as additional finishing elements to the aluminum profile ends designed for LED strips (item 9829401 / 9829301; not part of the information) and protect the LED strips from dust and moisture and allow the strips to be fed through. Each cap is individually packed in a labeled polybag. According to customs tariff law, these are "other goods made of plastic, other than those specified by TARIC codes 3926 1000 00 to 3926 9097 77".
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[1][1]. DEBTI6847/22-1#762347