Very politely ask the Customs Agent to show you the section of the law which he is using as his basis of authority to confiscate the imported items. If he is claiming that this is "drug paraphernalia" ask the Customs Agent again for the section of the law which specifically describes your items as "drug paraphernalia".
He will not be able to give you any law or section of the US Code, because there is no such section which lists what you described as a prohibited item, in which case you can demand at that point that they return the items they seized.
If it were illegal, it would be on the prohibited list and you would not have been permitted to import the items in the past.
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