These are large, round balloons made of a very heavy rubber. They typically are sold deflated, with a large rubber band. After you blow up the balloon, you tie the end in a knot, and secure the rubber band to the balloon. This makes a punching bag-like toy. It is fairly harmless, yet makes a lot of noise.

These balloons are a favorite amount recreational N2O users. They like the thickness of the balloon, because it doesn't pop as easily as regular party balloons. It also holds much a larger quantity.

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