No. Heading 4206 is limited to articles made from natural animal gut, goldbeater's skin, bladders, or tendons. Synthetic casings and strings made from plastics or regenerated cellulose are classified in other chapters according to their constituent material.
Silkworm gut is a textile fiber and is classified with silk products rather than with animal gut articles. The heading text explicitly excludes silkworm gut to prevent overlap with the silk chapter.
Heading 5 of 5 in chapter 42 · 1 product
Heading 4206 · $226K of $113.4M
Trade Directory
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Exports · August 2026
destination
Hong Kong and Costa Rica together take 100% of it.
customs district
origin
entry
rate provision · imports
ImportsExports
Imports
$144KYoY · free account
Exports
$226KYoY · free account
Low of 8 reported months · imports
Low · free accountFewer than 6 of the last 12 months reported trade, or the latest month was under $500K; the trend chart is not shown for thin series.
Through August 2026 · imports 8 of 12 months reported, exports 8 of 12 months reported. Source: U.S. Census Bureau.