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With either and neither, we should use a singular verb unless they are being used with or, in such a case, we can use either a singular verb or a plural one according to Grammar Monster (https://www.grammar-monster.com/lessons/either_or_plural_or_singular_verb.htm)

For example, "Either is acceptable.", "Neither of the boys is trying.", and, in your case, Neither of the balls has any air, since "has" is the singular form of "have"

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  • For plural concord under disjunction, the disjunctive NP nearest the verb should itself be plural on its own: Neither friends nor Romans have* come to bury Caesar.* – tchrist Dec 13 '23 at 12:33