Bare vulcanized rubber thread and cord, whether or not covered with textile material in a minor way, classifies under 4007. However, once the rubber thread is the core of a yarn that is predominantly textile in character — such as a gimped or covered elastic yarn — it typically classifies in the textile chapters rather than here. The essential character and the degree of textile covering determine the correct heading.

Yes, provided the article is a cord of vulcanized rubber and has not been further worked into a finished article such as a strap or bungee cord with hooks. Finished elastic tie-down assemblies would likely classify as articles of vulcanized rubber under a later heading in the chapter.