Cotton Balls are made from 100% pure cotton. Super soft, absorbent, and strong. They are perfect for the test tube hydration and test tube stopper.
For the Best fit:
- For 20mm test tube, use most if not all of a cotton ball.
- For 18mm test tube, cut in half in line with the fibres.
- For 16mm test tube, cut in half in line with the fibres and remove an approximate 2-3cm section from the wrap.
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