Update: Discovered one kinda significant flaw with these balloons. They don't seem to last quite as long as other balloons once blown up. It hasn't even been a month yet, and some of them have already spontaneously popped due to oxidation (and the ones that haven't popped yet are already heavily oxidized.). The other balloons I've had tended to last at least 2-3 months once blown up and they didn't oxidize nearly as fast.