HTS code 9902.11.91 covers "Plug-type closures of polyethylene, suitable for use in capping specimen tubes and measuring 15 mm in length; each closure having an upper portion designed to extend beyond the specimen tube to permit holding of the closure, such upper portion having a diameter of 15.5 mm and thickness of 3.3 mm and having a notched groove; with the bottom portion of such closure designed for insertion into a specimen tube having a diameter measuring approximately 11.7 mm; the foregoing closures certified by the importer as for use in an automated insertion system (provided for in subheading 3923.50.00)" under the US Harmonized Tariff Schedule. This is the official duty rate charged by US Customs when this product is imported into the United States, sourced directly from the U.S. International Trade Commission and refreshed daily.