Balloons are black and made of latex. They will blow up to 12 inches, roughly a basketball size. They hold helium for 6-8 hours. They will hold air for a few days.
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Please use caution with balloons around kids, CHOKING HAZARD – Children under 8 yrs. can choke or suffocate on uninflated or broken balloons. Adult supervision required. Keep uninflated balloons from children. Discard broken balloons at once.