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The balloon one is actually two balloons. A smaller one inside the larger. That way they cut off the bottom of the larger and the smaller one expands when you blow in it. The partial larger one moves up the inflated balloon and you don't see it. I haven't looked into the others yet but my guess it that they are all side of hand type things.
That said those things are still horrible for you. When I started in EMS I would go through about 3 a day. After 9 years of that I stopped drinking them. Been just over a year now.
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R.J. and Ginger
2019 Ram 3500 6.7 HO, Aisin Trans 3:73
Reese Goosebox
2019 Sandpiper 379FLOK
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