Customs tariff classification follows material composition and vehicle-specific use, restricting preferential treatment and supporting duty consequences.

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....HSN Explanatory Notes guide customs tariff classification where the Tariff Schedule gives no contrary indication. A Protector Tube shown by supplier material to be 100% PVC falls under the plastic-tube tariff entry rather than the rubber-hose entry; a certificate of origin using the latter classification prevents preferential customs benefit. Brake hose brackets and connectors designed solely or principally for automobile brake systems classify as motor-vehicle parts rather than generic plastic or residuary entries, resulting in differential duty. Under self-assessment, intentional incorrect tariff declarations causing short payment can support extended limitation and customs penalties, particularly where prior classifications, later duty-beneficial changes, admissions, and voluntary payments evidence misdeclaration.....