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The bubble you do fill with water as ross said but you may or may not fill it full , half full , etc. You can adjust the boyancy to suit your needs by adjusting just how much water you put in it. It enables you to cast out something light and then have it sit on top like with an egg or sink. I think full they weigh about 2 to 3 OZ and can be adjusted to float , be nuetral boyancy or sink when in the water.
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